Math 5 Trigonometry Final Exam Spring 2009
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1 Math 5 Trigonometry Final Exam Spring 009 NAME Show your work for credit. Write all responses on separate paper. There are 13 problems, all weighted equally. Your 3 lowest scoring answers problem will not be counted in your score, so you need only do 10 of the A rectangle s diagonal has a length of 10 cm and an angle of elevation of θ as shown to the right. Find the area of the rectangle as a function of θ. 10 cm θ. In the figure at right, arc BC subtends central angle BOC and circular angle BDC. Use the facts that ΔCOD is isosceles and that BOC and COD are supplementary to proved that BOC is twice as big as BDC. Try to present your response as a proof, supplying justifications for all your claims and logically deducing the desired result. 3. Alexis is looking for a mystery angle β. She knows that 1 sin( β ) =. She also knows that β is between 3 π radians 7π and radians. a. What is β? Give your answer in radian measure. b. What is β in degree measure? 4. For each of the following, draw the position of the terminal point corresponding to the input angle on the unit circle and give the (x,y) coordinates of that terminal point. Then form the proper ratio to compute the value of the function, if possible. If not possible, write does not exist. 9π a. cos( 0) c. cos e. sin ( 390 ) \ 15π 3π b. cos( 60 ) d. sin f. tan 4 5. A particular geometric object drawn in the Cartesian plane satisfies the description Every point (x,y) on the object is the same distance from the point (,5) as it is from the x-axis. a. Translate this description into an equation in x and y and simplify the equation to show that it is 10y = x 4x + 9. b. Complete the square on the right side of this equation and then divide both sides by 10 to put this equation in the form y = a( x h) + k c. Sketch a reasonably accurate graph of this equation. Label the vertex and at least one pair of points that are symmetric about the line of symmetry.
2 sin x + 5 tan x 6. Show a clear argument that the function f ( x) = is an even function (its graph is symmetric 3 x + x f x = f x for all x in the domain of f. about the y-axis). Recall that f is even if ( ) ( ) π 7. Sketch a nice graph of the function g( x) = 10 + cos x. Be sure that the range and the period are 4 evident from looking at the graph. (e,f) 8. The graph of the function f ( x) = 0 x + 3 is shown to the right. Find the values of a, b, c, d, e, and f Suppose cos θ = and 70 < θ < 360. (a,b) 13 a. Use the unit circle to draw the angle θ reasonably accurately. b. Find sin θ c. Find tan θ and sec θ (c,d) 10. a. In the triangle to the right, use the law of sines to find the value of x. b. Use the answer to part a) and the law of cosines to find the value of y. Your answer will involve the cosine of an unfamiliar angle, so you may leave your answer in terms of this cosine. 30 x in 10 in The minute hand of a clock does 1 rotation per 60 minutes. This is an angular velocity of π radians π = rad /min. 60 min 30 a. If the minute hand is 6 inches long, what is the linear velocity of the tip of the minute hand? b. How far (in inches) does the tip of the minute hand travel in 0 minutes? c. What is the area of the sector that is swept out by the minute hand in 0 minutes? y in 1. To the right is the graph of the function f ( x) = a sec( bx). Use the graph and your understanding of the secant function to determine the values of a and b. 13. Find the standard form of the rectangular equation for the hyperbola parameterized by x = sec(t) and y = tan(t). Find the vertices, foci and asymptotes of the hyperbola and illustrate these in a carefully constructed graph.
3 Math 5 Trigonometry Final Exam Solutions Spring A rectangle s diagonal has a length of 10 cm and an angle of elevation of θ as shown to the right. Find the area of the rectangle as a function of θ. Let h = height and w = width. Then h = 10sin(θ) and w = 10cos(θ) so the area is A(θ) = 100sin(θ)cos(θ). θ 10 cm. In the figure at right, arc BC subtends central angle BOC and circular angle BDC. Use the facts that ΔCOD is isosceles and that BOC and COD are supplementary to prove that BOC is twice as big as BDC. Try to present your response as a proof, supplying justifications for all your claims and logically deducing the desired result. SOLN Claim 1. ΔCOD is isosceles D = C BOC + COD = 180 D+ COD = BOC = D QED Reason 1. OD = OC are radii of the same circle.. Base angles of an isosceles triangle are congruent. 3. Supplementary angles 4. Sum of interior angles of a triangle and substitution 5. Subtraction, reflective property of = and transitive property of = Alexis is looking for a mystery angle β. She knows that sin( β ) =. 7π She also knows that β is between 3 π radians and radians. a. What is β? Give your answer in radian measure. So β is in QIII and the reference angle is π/6. Thus π 19π β = 3π + = 6 6 b. What is β in degree measure? 19π 180 β = = π
4 4. For each of the following, draw the position of the terminal point corresponding to the input angle on the unit circle and give the (x,y) coordinates of that terminal point. Then form the proper ratio to compute the value of the function, if possible. If not possible, write does not exist. 1 9π a. cos( 0) = 1 b. cos( 60 ) = c. cos = 0 d. 15π sin = 1 3π e. sin ( 390 ) = f. tan 4 The point is the same as in (b) but the ratio does not exist. 5. A particular geometric object drawn in the Cartesian plane satisfies the description Every point (x,y) on the object is the same distance from the point (,5) as it is from the x-axis. a. Translate this description into an equation in x and y and simplify the equation to show that it is 10y = x 4x + 9. Equating the squares of the distances leads to y = (x ) + (y 5). Expanding, collecting like terms and adding 10y to both sides then leads quickly to the desired equation. b. Complete the square on the right side of this equation and then divide both sides by 10 to put this equation in the form y = a( x h) + k y = x 4x+ 9 = ( x ) + 5 y = ( x ) + 10 c. Sketch a reasonably accurate graph of this equation. Label the vertex and at least one pair of points that are symmetric about the line of symmetry. Vertex A(,.5) and symmetric points B( 3,5) and C( 3,5) sin x + 5 tan x 6. Show a clear argument that the function f ( x) = is an even function (its graph is symmetric 3 x + x about the y-axis). Recall that f is even if f ( x) = f ( x) for all x in the domain of f. sin ( x) + 5tan ( x) sin x 5tan x ( sin x+ 5tan x) sin x+ 5tan x f ( x) = = = = = f ( x ) 3 ( x) + ( x) x x ( x + x) x + x 7. Sketch a nice graph of the function π g( x) = 10 + cos x. Be sure 4 that the range and the period are evident from looking at the graph. The amplitude of oscillates from 8 to 1 about a line y = 10 with period = 8.
5 (e,f) 8. The graph of the function f ( x) = 0 x + 3 is shown to the right. Find the values of a, b, c, d, e, and f. The domain is [ 18,] and the range is 3,3 + 5 The graph has symmetry about the line x =. Thus a = 18, b = d = 3, c =, e = and f = (a,b) (c,d 5 9. Suppose cos θ = and 70 < θ < a. Use the unit circle to draw the angle θ reasonably accurately. Soln: It s in QIV, as shown to right. 5 1 b. Find sin θ, Soln: The y-coordinate is = 1 = = c. Find tan θ and sec θ 1 /13 1 tanθ = = and 5/ sec θ = = 5/ a. In the triangle to the right, use the law of sines to find the value of x. x 10 x 10 0 = = x = = 10 sin 45 sin 30 1/ 1/ b. Use the answer to part a) and the law of cosines to find the value of y. y = ( 10 ) + 10 ( 10 )( 10) cos( 105 ) = cos( 105 ) 30 x in y in 10 in The minute hand of a clock does 1 rotation per 60 minutes. This is an angular velocity of π radians π = rad /min. 60 min 30 a. If the minute hand is 6 inches long, what is the linear velocity of the tip of the minute hand? v = ωr = π/5 cm/min b. How far (in inches) does the tip of the minute hand travel in 0 minutes? d = vt = (π/5)0 = 4π cm. c. What is the area of the sector that is swept out by the minute hand in 0 minutes? A = r θ/ = 36(π/3) = 1π cm.
6 1. To the right is the graph of the function f ( x) = a sec( bx). Use the graph and your understanding of the secant function to determine the values of a and b. y = 4sec(πx/4) so a = 4 and b = π/4 This is deduced by observing that the usual gap in y-values: ( 1,1) is stretched by 4 to ( 4,4) and the asymptotes at x = π/ and x = π/ are stretched to x = and x =. 13. Find the standard form of the rectangular equation for the hyperbola parameterized by x = sec(t) and y = tan(t). Find the vertices, foci and asymptotes of the hyperbola and illustrate these in a carefully constructed graph. sec (t) tan y (t) = 1 leads to x = 1 so the vertices are at (1,0) and ( 1,0) the foci are at ( ± 5,0), the 4 asymptotes are y = x and y = x.
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