AP Calculus AB. Section 1.1 Lines Homework: complete pgs.9-10 #3, 6, 11, 16, 19, 32, 43, 46 in the textbook
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1 AP Calculus AB Shupe UNIT 1 Prerequisites for Calculus Name Period Over the summer, you will need to complete the following problems from the textbook. These will be collected, so be sure to show your work. I ve attached notes for each section to use as an aid and the textbook homework problems in case you don t have a book yet. Feel free to me (shupea@cbchs.org) this summer if you need help You will take a formative assessment over these sections when school starts (probably the first or second day). Then, you will complete more practice problems and learn about Section 1.4. Finally, you will take a summative assessment over all of the sections. Section 1.1 Lines Homework: complete pgs.9-10 #3, 6, 11, 16, 19, 32, 43, 46 in the textbook Section 1.2 Functions and Graphs Homework: complete pgs #4, 5, 12, 23, 26, 31, 34, 39, 40, 42, 47, 52 in the textbook Section 1.3 Exponential Functions Homework: complete pgs #4, 5, 8, 11, 13-15, 18, 20-24, in the textbook Section 1.5 Functions and Logarithms Homework: complete pg.44 #3-6, 13, 16, 19, 24, 25, 28, 31, 34, 35, 38, 43, 46, 47 in the textbook Section 1.6 Trigonometric Functions Homework: complete pgs #2, 3, 10, 12, 13, 18, 21, 27-30, 38, 42 in the textbook 1
2 SECTION 1.1 LINES increments: the amounts (positive, negative, or zero) that a particle moves from one point to another in the coordinate plane i.e. x (delta x )and y (delta y) EX1 Find the coordinate increments from (-4, 3) to (5, -1). x = = 9 y = 1 3 = 4 slope: a measure of the number of units a nonvertical line rises (or falls) vertically for each unit of horizontal change from left to right Lines that go uphill have positive slopes. Lines that go downhill have negative slopes. Horizontal lines have slopes of zero. Vertical lines have undefined slopes. parallel lines: never intersect and have equal slopes m 1 = m 2 perpendicular lines: intersect to form a 90 angle and have slopes that are opposite reciprocals m 1 = 1 m 2 EX2 Write the equation for a vertical line and a horizontal line through the point (-7,2). x = 7 y = 2 point-slope equation: y y 1 = m(x x 1 ) or y = m(x x 1 ) + y 1 EX3 Write the point-slope equation for the line through the point (6, 9) with slope -4/3. y 9 = 4 4 (x 6) or y = (x 6) y-intercept: the y-coordinate of the point where a nonvertical line intersects the y-axis (0, b) x-intercept: the x-coordinate of the point where a nonhorizontal line intersects the x-axis (a, 0) slope-intercept equation: y = mx + b Shupe1
3 EX4 Write the slope-intercept equation for the line through the point (6,9) and (-2,5). m= 5 9 = 4 = 1 y 9 = 1 (x 6) y = 1 x general linear equation: Ax + By = C where A and B are not both 0 EX5 Find the slope and y-intercept of the line 2x + 7y = 21. Graph the line. 7y = 2x + 21 y = 2 7 x + 3 EX6 Write an equation for the line through the point (2, -1) that is (a) parallel, and (b) perpendicular to the line L: y = 4x 3. m L = 4 (a) m = 4 y + 1 = 4(x 2) (b) m = 1 4 y + 1 = 1 4 (x 2) Shupe2
4 Section 1.1 Lines 9 Quick R eview 1.1 (For help, g o to Section 1.1.) 1. Find the value of y that corresponds to x = 3 in y = (x - 3). 2. Find the value of x that corresponds to y = 3 in y = 3-2{x + 1). In Exercises 3 and 4, find the value of m that corresponds to the values of x and y. y ~ 3 3. x = 5, y = 2, m = - x 4 2 v 4. j c = 1, y = 3, m = x In Exercises 5 and 6, determine whether the ordered pair is a solution to the equation. 5. 3x 4y = 5 6. y = 2x + 5 (a) (2, 1/4) (b) (3,-1 ) (a) (-1,7 ) (b) (-2,1 ) In Exercises 7 and 8, find the distance between the points. 7. (1,0), (0,1) 8. (2,1), (1, 1/3) In Exercises 9 and 10, solve for y in terms of x x - 3 y = x + 5y = -3 Section 1.1 Exercises In Exercises 1^1, find the coordinate increments from A to B. 1. A (l,2), B( 1, 1) 2. A (-3,2 ), B ( - l, - 2 ) 3. A (-3, 1), B( 8, 1) 4. A(0, 4), B(0,- 2 ) In Exercises 5-8, let L be the line determined by points A and B. (a) Plot A and B. (b) Find the slope of L. (c) Draw the graph of L. 5. A(l, 2), B(2,1) 6. A ( - 2,-1 ), 5 (1,- 2 ) 7. A(2, 3), B( 1,3) 8. A(l, 2), B(l, - 3 ) In Exercise 9-12, write an equation for (a) the vertical line and (b) the horizontal line through the point P. 9. P(3,2) 10. P { - 1,4/3) 11. P{0, - V 2 ) 12. P(-7T, 0) In Exercises 13-16, write the point-slope equation for the line through the point P with slope m. 13. P (l, 1), m = P ( - l, 1), m = P(0, 3), m = P (-4, 0), m = - 2 In Exercises 17-20, write the slope-intercept equation for the line with slope m and y-intercept b. 17. m = 3, b = m = 1, b = m = 1/2, b = m = 1/3, /; = I In Exercises 21-24, write a general linear equation for the line through the two points. 21. (0, 0), (2,3) 22. (1, 1), (2, 1) 23. (-2, 0), (-2, - 2 ) 24. ( -2, 1), (2, -2 ) In Exercises 25 and 26, the line contains the origin and the point in the upper right comer of the grapher screen. Write an equation for the line [ ] by [ ] In Exercises 27-30, find the (a) slope and (b) y-intercept, and (c) graph the line x + 4y = x + y = Z = y = 2x In Exercises write an equation for the line through P that is (a) parallel to L, and (b) perpendicular to L. 31. P(0,0), L:y = -;c P (-2, 2), L: 2x + y = P (-2,4 ), L:x = P ( - l, 1/2), L: y = 3 In Exercises 35 and 36, a table of values is given for the linear function f(x) = mx + b. Determine m and b x fix) x fix)
5 10 Chapter 1 Prerequisites for Calculus In Exercises 37 and 38, find the value of x or y for which the line through A and B has the given slope m. 37. A (-2, 3), B(4,y), m = - 2 /3 38. A (-8, -2 ), B(x, 2), tn = Revisiting Example 4 Show that you get the same equation in Example 4 if you use the point (3, 4) to write the equation. 40. Writing to Learn x- and y-intercepts (a) Explain why c and d are the jc-intercept and v-intercept, respectively, of the line (b) How are the x-intercept and y-intercept related to c and d in the line = 2? c d 41. Parallel and Perpendicular Lines For what value of k are the two lines 2x + ky = 3 and x + y 1 (a) parallel? (b) perpendicular? Group Activity In Exercises 42-44, work in groups of two or three to solve the problem. 42. Insulation By measuring slopes in the figure below, find the temperature change in degrees per inch for the following materials. (a) gypsum wallboard (b) fiberglass insulation (c) wood sheathing (d) Writing to Learn Which of the materials in (a)-(c) is the best insulator? the poorest? Explain. 44. Modeling Distance Traveled A car starts from point P at time / = 0 and travels at 45 mph. (a)write an expression d(t) for the distance the car travels from P. (b) Graph y = d(t). (c) What is the slope of the graph in (b)? What does it have to do with the car? (d) Writing to Learn Create a scenario in which t could have negative values. (e) Writing to Learn Create a scenario in which the v-intercept of y = d(t) could be 30. In Exercises 45 and 46, use linear regression analysis. 45. Table 1.2 shows the mean annual compensation of construction workers. Construction Workers' Average Annual Compensation Year Annual Total Compensation (dollars) , , , ,966 Source: U.S. Bureau of the Census, Statistical Abstract of the United States, (a) Find the linear regression equation for the data. (b) Find the slope of the regression line. What does the slope represent? (c) Superimpose the graph of the linear regression equation on a scatter plot of the data. (d) Use the regression equation to predict the construction workers average annual compensation in the year Table 1.3 lists the ages and weights of nine girls. Table 1.3 Girls' Ages and Weights Age (months) Weight (pounds) Distance through wall (inches) 43. Pressure under Water The pressure p experienced by a diver under water is related to the diver s depth d by an equation of the formp = k d + \ { k a constant). When d = 0 meters, the pressure is 1 atmosphere. The pressure at 100 meters is atmospheres. Find the pressure at 50 meters. (a) Find the linear regression equation for the data. (b) Find the slope of the regression line. What does the slope represent? (c) Superimpose the graph of the linear regression equation on a scatter plot of the data. (d) Use the regression equation to predict the approximate weight of a 30-month-old girl.
6 1.2 Functions and Graphs
7 Functions function: a mapping in which each element in the domain corresponds to exactly one element in the range Function Not a function
8 Leonhard Euler He invented y is a function of x. y=f(x) We say y equals f of x.
9 EX1 Write a formula that expresses the area of a circle as a function of its radius. A(r) = πr 2
10 Interval Notation Closed intervals contain their boundary points. Open intervals contain no boundary points.
11 Interval Notation (cont.)
12 EX2 Identify the domain, range, and sketch the graph. y = 1 x D:, 0 0, R:, 0 0,
13 EX3 Identify the domain, range, and sketch the graph. y = x D: [0, ) R: [0, )
14 EX4 Identify the domain, range, and sketch the graph with a calculator. y = 4 x 2 D: [ 2,2] R: [0,2]
15 These need to be memorized!
16 These need to be memorized!
17 These need to be memorized!
18 These need to be memorized!
19 Even & Odd Functions For every x in the domain, the function y = f(x) is an even function of x if f(-x) =f(x) and symmetric about the y-axis odd function of x if f(-x) = -f(x) and symmetric about the origin This helps when graphing a function by determine its symmetry.
20 EX5 Determine if the function is even, odd, or neither. 3 y x x y = x 3 x is odd because f x x x x x x x f x Slide 1-15
21 EX6 Determine if the function is even, odd, or neither. y = 2x + 5 y = 2x + 5 is neither because f x = 2 x + 5 = 2x + 5 f x = 2x 5 Slide 1-16
22 EX7 Graph the piecewise function. f x = x, x < 0 x 2, 0 x 1 1, x > 1
23 EX8 Write an equation for the function shown. f x = x, 0 x < 1 x 1, 1 x 2 (Check with a calculator.) Y 1 = x 0 x x < 1 Y 2 = x 1 1 x x 2
24 EX9 Given f(x)=x-7 and g(x)=x 2, find f(g(x)) and f(g(2)). f g x = f x 2 = x 2 7 f g 2 = = 3
25 Section 1.2 Functions and Graphs 19 Section 1.2 Exercises In Exercises 1-4, (a) write a formula for the function and (b) use the formula to find the indicated value of the function. 1. the area A of a circle as a function of its diameter d\ the area of a circle of diameter 4 in. 2. the height h of an equilateral triangle as a function of its side length s; the height of an equilateral triangle of side length 3 m 3. the surface area S of a cube as a function of the length of the cube s edge e; the surface area of a cube of edge length 5 ft 4. the volume V of a sphere as a function of the sphere s radius r; the volume of a sphere of radius 3 cm In Exercises 5-12, (a) identify the domain and range and (b ) sketch the graph of the function. 5. y = 4 - x2 1. y = 2 + V x y = y = x y = V x 10. y = V ^x 35. Writing to Learn The vertical line test to determine whether a curve is the graph of a function states: If every vertical line in the xy-plane intersects a given curve in at most one point, then the curve is the graph of a function. Explain why this is true. 36. Writing to Learn For a curve to be symmetric about the x-axis, the point (x, y) must lie on the curve if and only if the point (x, y) lies on the curve. Explain why a curve that is symmetric about the x-axis is not the graph of a function, unless the function is y = 0. In Exercises 37-40, use the vertical line test (see Exercise 35) to determine whether the curve is the graph of a function. 37. y y = 1 + l l - y = 1 + In Exercises 13-20, use a grapher to (a) identify the domain and range and (b) draw the graph of the function. 13. y = V T 14. y = 2V3 - x 15. y = V l x2 17. y = x2 x2/5 19. y = V x y = V 9 x2 18. y = x3/2 20. y = In Exercises 21-30, determine whether the function is even, odd, or neither. Try to answer without writing anything (except the answer). 21. y = x4 22. y = x + x2 23. y = x y = x y = V x y = x + x3 v3 27. y = - x y = v y = 1 _ X , graph the piec 30. y = In Exercises 41-48, write a piecewise formula for the function y - i - l /(x) = 3 x, x < 1 2x, 1 < X 32. f{x) = 1, x < 0 V x, x > /(x ) = 34. f{x) = 4 - x2 X < (3/2)x + 3/2, 1 < x + 3, X > X2, x < 0 *3, 0 < x < 1 2x 1 X > 1 X (2, - 1)
26 2 0 Chapter 1 Prerequisites for Calculus (-2,-1) 2< \. o (1,-1) (3,-1) (a) Find the quadratic regression for the data in Table 1.5. Let x = 0 represent 1990, x = 1 represent 1991, and so forth. (b) Superimpose the graph of the quadratic regression equation on a scatter plot of the data. (c) Use the quadratic regression to predict the amount of revenue in (d) Now find the linear regression for the data and use it to predict the amount of revenue in The Cone Problem Begin with a circular piece of paper with a 4-in. radius as shown in (a). Cut out a sector with an arc length of x. Join the two edges of the remaining portion to form a cone with radius r and height h, as shown in (b). In Exercises 49 and 50, (a) draw the graph of the function. Then find its (b) domain and (c) range. 49. fix ) = x\ / ( x) = 2\x In Exercises 51 and 52, find (a)/(g(x)) (b) g(f(x)) (c)/(g(0)) (d)g(/(0)) (e) g(g(-2» (f) / ( / «) 51. f(x ) = x + 5, g(x) = x f(x) = x + 1, g(x) := X Copy and complete the following table. g(x) fix) i f g)(x) (a)? V x - 5 V x2-5 (b)? 1+ 1/x X (c) \/x 9 X (d) Vx 7 * * IV 54. Broadway S eason Statistics Table 1.5 shows the gross revenue for the Broadway season in millions of dollars for several years. Table 1.5 Year Broadway Season Revenue Amount ($ millions) Source: The League of American Theatres and Producers, Inc, New York, NY, as reported in The World Almanac and Book of Facts, o (a) Explain why the circumference of the base of the cone is 877 x. (b) Express the radius r as a function of x. (c) Express the height h as a function of x. (d) Express the volume V of the cone as a function of x. 56. Industrial Costs Dayton Power and Light, Inc., has a power plant on the Miami River where the river is 800 ft wide. To lay a new cable from the plant to a location in the city 2 mi downstream on the opposite side costs $180 per foot across the river and $100 per foot along the land. (a) Suppose that the cable goes from the plant to a point Q on the opposite side that is x ft from the point P directly opposite the plant. Write a function C(x) that gives the cost of laying the cable in terms of the distance x (b) Generate a table of values to determine if the least expensive location for point Q is less than 2000 ft or greater than 2000 ft from point P. (b) I< mi »l
27 1.3 Exponential Functions
28 Real-life application If you started with $100 in a savings account that had an interest rate of 5.5% compounded annually, how much would be in the account in 12 years without any additional contributions? T = 100(1.055) y T = 100(1.055) 12 =$ where T is total, y is years This is called exponential growth. The model y = Pa x where P is the initial investment and a is equal to the 1 plus the interest rate expressed as a decimal.
29 Exponential Functions Exponential functions are of the form f(x) = a x where a>0, a 1. What is the domain and range of all exponential functions of the form f(x) = a x? D: (, ) R: (0, ) What are the x and y-intercepts for all exponential functions of the form f(x) = a x? x int: 0 = a x y int: (0, f 0 )
30 EX1 Graph the function. State the domain and range. Find any roots. D: (, ) R: ( 4, ) Roots: 0 = 2 3 x 4 x 0.63
31 Population growth can often be modeled with an exponential function World Population: million To find Ratio: The world population in any year is about times the previous year. EX2 Predict the world population in Number of years past 1986 P = 4936(1.018) About 7.6 billion people.
32 Current world population
33 Radioactive decay can also be modeled with an exponential function. EX3 Suppose you start with 5 grams of a radioactive substance that has a half-life of 20 days. When will there be only one gram left? After 20 days: = days: t days: y = = t 20 2 = t 20 2 = 5 4 Graphically, t days
34 Exponential growth: If a > 1, then y = ka x, k > 0. Exponential decay: If 0 < a< 1, then y = ka x, k > 0.
35 Many real-life phenomena can be modeled by an exponential function with base e, where e e can be approximated by: f x As x, f x e 1 1 x x Graph: f(x) in a [-10,10] by [-5,10] window
36 Continuous Compound Interest P = Principle or initial investment r = Yearly interest rate (as a decimal) t = time in years
37 Continuous Compound Interest EX4 Determine amount in account after 10 years if initial investment was $1000 with yearly interest rate of 5% (a) Compounded continuously (b) Compounded yearly (c) Compounded monthly a) y = 100e 0.05(10) = $ b) y = 1000e 1.05(10) = $ c) A = P 1 + r n nt = (10) = $
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40 Section 1.5 Functions and Logarithms May 17, Functions and Logarithms Aug 19 7:26 AM One-to-One A function f(x) is one to one on a domain if whenever. Aug 19 7:26 AM 1
41 Section 1.5 Functions and Logarithms May 17, 2016 Inverses A function g is the inverse function of the function f if for each x in the domain of g and for each x in the domain of f. The function g is denoted by Recall: If The domain of f becomes the range of and the range of f becomes the domain of Aug 19 7:26 AM EX1 Show that the functions are inverses of each other. Aug 19 7:26 AM 2
42 Section 1.5 Functions and Logarithms EX2 Graph the function and its inverse parametrically. May 17, 2016 Aug 19 7:26 AM Recall: where >0, 1 This is a one to one function, therefore it has an inverse. The inverse is called a logarithm function. Example: The most commonly used bases for logs are: 10: and e: is called the natural log function. is called the common log function. Aug 19 7:26 AM 3
43 Section 1.5 Functions and Logarithms EX3 Sketch the graphs of each function and its inverse. x y = 10 y = log x May 17, 2016 x y = e y = ln x Aug 19 7:26 AM Properties of Logarithms Product rule: Quotient rule: Power rule: Change of base formula: Aug 19 7:26 AM 4
44 Section 1.5 Functions and Logarithms May 17, 2016 EX4 Rewrite each of the following in logarithmic form. 4^2 = 16 5^3 = 125 e^2 = 7.39 Rewrite each of the following in exponential form. Aug 19 7:26 AM EX5 Solve for x: log a 4 + log a 6 = log a ( x+ 4) Solve for x: log 4 (x + 6) log 4 (x 1) = log 4 5 Solve for x: 3 log b x = log b 8 Solve 4 x = 65 Evaluate the value of log 4 20 Aug 19 7:26 AM 5
45 Section 1.5 Functions and Logarithms EX6 $1000 is invested at 5.25 % interest compounded annually. How long will it take to reach $2500? May 17, 2016 Aug 19 7:26 AM 6
46 4 4 Chapter 1 Prerequisites fo r Calculus Section 1.5 Exercises In Exercises 1-6, determine whether the function is one-to-one. 1. y 2. y y y = int x In Exercises 7-12, determine whether the function has an inverse function. 7. y = y = x2 + 5x 9. y = x3 4x + 6 x y = x3 + x 11. y = In.*2 12. y = 23~x In Exercises 13-24, find/-1 and verify that ( / r 1) w = ( r 1 / ) w = x. 13. f{x) = 2x fix) = 5-4x 15. fix) = x fix) = x x > fix) = x2, x < fix) = x2/3, x > fix) = - (x - 2)2, x < /(x) = x2 + 2 x + l, x & 1 1 1_ 21. fix) = x > /(x) = xz.v x3 x fix) = 24. /(x) = x + 3 x 2 In Exercises 25-32, use parametric graphing to graph/,f~x, and y = x. 25. /(x) = 26. fix) = 3A 27. fix) = 2~x 28. fix) = 3~x 29. fix) = lnx 30. fix) = logx 31. fix) = sin-1 x 32. fix) = tan-1 x In Exercises 33-36, solve the equation algebraically. Support your solution graphically. 33. (1.045)' = e005' = ex + e~x = X + 2~x = 5 In Exercises 37 and 38. solve for y. 37. In y = 2t In (y 1) In 2 = x + In x In Exercises 39^-2, draw the graph and determine the domain and range of the function. 39. y = 2 In (3 x) y = - 3 log (x + 2) y = log2 ix + 1) 42. y = log3 (x - 4) In Exercises 43 and 44, find a formula f o r /-1 and verify that i f f ~ l)ix) = i r l 0 f)ix) = * fix) = 44. fix) = 1 + 2~x j + u Self-inverse Prove that the function/is its own inverse. (a)/(x) = V l - x 2, x > 0 (b)/(x) = 1 /x 46. Radioactive Decay The half-life of a certain radioactive substance is 12 hours. There are 8 grams present initially. (a) Express the amount of substance remaining as a function of time t. (b) When will there be 1 gram remaining? 47. Doubling Your Money Determine how much time is required for a $500 investment to double in value if interest is earned at the rate of 4.75% compounded annually. 48. Population Growth The population of Glenbrook is 375,000 and is increasing at the rate of 2.25% per year. Predict when the population will be 1 million. In Exercises 49 and 50, let x = 0 represent 1990, x = 1 represent 1991, and so forth. 49. N atural Gas Production (a) Find a natural logarithm regression equation for the data in Table 1.16 and superimpose its graph on a scatter plot of the data. 1 Table Canada's Natural Gas Production Year Cubic Feet (trillions) Source: Statistical Abstract o f the United States, (b) Estimate the number of cubic feet of natural gas produced by Canada in Compare with the actual amount of 6.63 trillion cubic feet in (c) Predict when Canadian natural gas production will reach 7 trillion cubic feet.
47 1.6 Trigonometric Functions
48 Radian Measure When radius (r) equals arc length (s), then the angle that is formed (Θ) measures one radian. The unit of radians will be used exclusively in Calculus unless otherwise noted. Degrees Radians π 6 45 π 4 60 π 3 90 π π 270 3π π
49 Arc Length Formula s = rө s = arc length r = radius Ө = angle measured in radians EX1 Find the arc length an ant walks if the circle it is on has a diameter of 14 inches and the angle he goes through is π 3. s = 7 π 3 = 7π in
50 Name the six trig functions and the side ratios they represent. sinθ = y r = y cscθ = r y = 1 y cosθ = x r = x secθ = r x = 1 x tanθ = y x cotθ = x y
51 Trig Functions
52 Reciprocal Trig Functions
53 Even and Odd Trig Functions The graphs of sin x, csc x, tan x and cot x are odd functions because they are symmetric about the origin. sin sin The graphs of cos x and sec x are even functions because their graphs are symmetric about the y-axis. cos cos
54 The rules for shifting, stretching, shrinking, and reflecting the graph of a function apply to trigonometric functions. Vertical stretch or shrink; reflection about x-axis is a stretch. a 1 Vertical shift Positive d moves up. y a f bx c d Horizontal stretch or shrink; reflection about y-axis b 1 is a shrink. Horizontal shift Positive c moves left. The horizontal changes happen in the opposite direction to what you might expect.
55 When we apply these rules to sine and cosine, we use some different terms. A is the amplitude. Vertical shift B 2 f x Asin x C D B is the period. Horizontal shift 4 B *sinusoid A 3 C 2 D 1 y x x sin 1 2 4
56 EX2 Determine the amplitude, period, domain, range and sketch the graph. y = 3 sin 2(x - π) + 4 amp: 3 period: 2π B = 2 π = B D:, R: [1,7] b/c vertical shift of 4 and amp y = 4 sec (3x (3π/4)) - 2 *use calculator period: y = 4 sec [3(x (π/4)] - 2 2π B = 3 2π 3 = B D: x π 12, 5π 12, 3π 4, 13π 12, etc. x π 4, 7π 12, 11π 12, 5π 4, etc. R: y 12, y 4 b/c vertical shift of 2
57 Trig functions are not one-to-one. However, the domain can be restricted for trig functions to make them one-to-one. 2 y sin x These restricted trig functions have inverses.
58 Inverse Trigonometric Functions
59 Inverse Trigonometric Functions
60 EX3 Solve by hand then check with calculator. tan(sin -1 (.5)) = x, where [0,2π) sin = θ tan π 6 = 3 3 sinθ = 1 2 θ = π 6 sin(cos -1 (1)) = x, where [0,2π) cos 1 1 = θ cosθ = 1 θ = 0, 2π except only keep 0 sin0 = 0 *check with calculator
61 52 Chapter 1 Prerequisites fo r Calculus Quick R eview 1.6 (For help, go to Sections 1.2 and 1.6.) In Exercises 1^1, convert from radians to degrees or degrees to radians / In Exercises 5-7, solve the equation graphically in the given interval. 5. sin* = 0.6, 0 < x < 27r 6. cos x = 0.4, 0 < x < 27t _, tt 3-rr 7. tan x = 1, <x < Show that f(x) = 2x2 3 is an even function. Explain why its graph is symmetric about the y-axis. 9. Show that f(x) = x3 3.r is an odd function. Explain why its graph is symmetric about the origin. 10. Give one way to restrict the domain of the function/(x) = xa - 2 to make the resulting function one-to-one. Section 1.6 Exercises In Exercises 1-4, the angle lies at the center of a circle and subtends an arc of the circle. Find the missing angle measure, circle radius, or arc length. Angle / ? Radius 2? 14 Arc Length? /2 In Exercises 5-8, determine if the function is even or odd. 5. secant 6. tangent 7. cosecant 8. cotangent In Exercises 9 and 10, find all the trigonometric values of 6 with the given conditions. 9. cos 6 =, 17 sin 0 > tan 6 = 1, sin 9 < 0 In Exercises 11-14, determine (a) the period, (b) the domain, (c) the range, and (d) draw the graph of the function. 11. y = 3 csc (3x + 77) y = 2 sin [Ax + 77) y = 3 tan (3x + 77) y = 2 sin (2x + In Exercises 15 and 16, choose an appropriate viewing window to display two complete periods of each trigonometric function in radian mode. 15. (a) y = sec x (b) y = csc x (c) y = cot x 16. (a) y = sin x (b) y = cos x (c) y = tan x In Exercises 17-22, specify (a) the period, (b) the amplitude, and (c) identify the viewing window that is shown. 17. y 1.5 sin 2x 23. Group Activity A musical note like that produced with a tuning fork or pitch meter is a pressure wave. Table 1.19 gives frequencies (in Hz) of musical notes on the tempered scale. The pressure versus time tuning fork data in Table 1.20 were collected using a CBL and a microphone. Table 1.19 Note Frequencies of Notes Frequency (Hz) c 262 C«or Db 277 D 294 D# or Eb 311 E 330 F 349 F or Gb 370 G 392 G# or Ab 415 A 440 A* or Bb 466 B 494 C (next octave) 524 Source: CBL System Experimental Workbook, Texas Instruments, Inc., 1994.
62 Section 1.6 Trigonometric Functions 53 Table 1.20 Tuning Fork Data Time (s) Pressure Time (s) Pressure (a) Find a sinusoidal regression equation for the data in Table 1.20 and superimpose its graph on a scatter plot of the data. (b) Determine the frequency of and identify the musical note produced by the tuning fork. 24. Temperature Data Table 1.21 gives the average monthly temperatures for St. Louis for a 12-month period starting with January. Model the monthly temperature with an equation of the form y = a sin [b(t h)] + k, y in degrees Fahrenheit, t in months, as follows: Table 1.21 Time (months) Temperature Data for St. Louis Temperature ( F) (a) Find the value of b assuming that the period is 12 months. (b) How is the amplitude a related to the difference 80 30? (c) Use the information in (b) to find k. (d) Find /?, and write an equation for y. (e) Superimpose a graph of y on a scatter plot of the data. In Exercises 25-26, show that the function is one-to-one, and graph its inverse. 25. y = cos x, 0 < x tt 7T, y = tan x, < x < In Exercises 27-30, give the measure of the angle in radians and degrees. Give exact answers whenever possible. 27. sin -1(0.5) 28. sin 1 -^ 29. tan 1(-5 ) 30. cos-' (0.7) In Exercises 31-36, solve the equation in the specified interval. 31. tan x = 2.5, 0 < x < 27r 32. cos x = 0.7, 2t7 < x < 47t 33. csc x = 2, 0 < x < 2ir 34. sec x = 3, it x < tt 35. sin.x = -0.5, co < * < 36. cot x = 1, oo < * < In Exercises 37^-0, use the given information to find the values of the six trigonometric functions at the angle 9. Give exact answers. 37. d = sin 1,i s = " ( - i 39. Lhe point P( 3, 4) is on the terminal side of The point P( 2, 2) is on the terminal side of 6. In Exercises 41 and 42, evaluate the expression. 41. sin ( cos ' I 42. tan ( sin Temperatures in Fairbanks, Alaska Find the (a) amplitude, (b) period, (c) horizontal shift, and (d) vertical shift of the model used in the figure below, (e) Then write the equation for the model. ^ ^ ^ ^ cp OcV ^ Normal mean air temperature for Fairbanks, Alaska, plotted as data points (red). The approximating sine function f(x) is drawn in blue. Source: "Is the Curve of Temperature Variation a Sine Curve?" by B. M. Lando and C. A. Lando, The Mathematics Teacher, 7.6, Fig. 2, p. 535 (Sept. 1977). 44. Temperatures in Fairbanks, Alaska Use the equation of Exercise 43 to approximate the answers to the following questions about the temperatures in Fairbanks, Alaska, shown in the figure in Exercise 43. Assume that the year has 365 days. (a) What are the highest and lowest mean daily temperatures? (b) What is the average of the highest and lowest mean daily temperatures? Why is this average the vertical shift of the function?
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