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1 APPM 1350 Eam 2 Fall The following parts are not related: (a) (12 pts) Find y given: (i) y = (ii) y = sec( 2 1) tan() (iii) ( 2 + y 2 ) 2 = 2 2 2y 2 1 (b) (8 pts) Let f() be a function such that f(2 + 1) f(2) = 0 and f (1) = f (1) = 4. Find f (2). (a) (i) Using the quotient rule we have, d d [ ] 1 = 1 1 [(1/2)(1 ) 1/2 ( 1)] (1 ) 1/2 + ( = 1 ) 2 (1 ) 1/2 2 1 so factoring out the (1 ) 1/2 term from the numerator yields 2 [ ] d = (1 ) 1/2 [2(1 ) + ] d 1 2(1 ) = 2 2(1 ) 3/2 (a) (ii) Taking the derivative yields, so, simplifying yields [sec( 2 1) tan()] = sec( 2 1) tan( 2 1)(2) [1 tan() + sec 2 ()] [sec( 2 1) tan()] = 2 sec( 2 1) tan( 2 1) tan() sec 2 () (a) (iii) Using implicit differentiation, we have d [ ( 2 + y 2 ) 2 = 2 2 2y 2] = 2( 2 + y 2 )(2 + 2yy ) = 4 4yy d Now distributing the 2( 2 + y 2 ) term and collecting all the derivatives on one side yields 2( 2 + y 2 )(2yy ) + 4yy = 4 2( 2 + y 2 )(2) ( 2 + y 2 )(4yy ) + 4yy = 4 4( 2 + y 2 ) ( y 2 )4yy = 4(1 2 y 2 ) and so, y = 4(1 2 y 2 ) 4y( y 2 ) = (1 2 y 2 ) y( y 2 ) (b) First we take the derivative implicitly, [ ] d f(2 + 1) f(2) = 0 d 2f (2 + 1) f(2) 2f (2) = 0 The second derivative will be 4f (2 + 1) 4f (2) 4f (2) = 0. Now, let = 1/2, we find And thus f (2) = 6 4f (2) 4f (1) 2f (1) = 0
2 2. The following parts are not related: (a) (10 pts) When a certain polyatomic gas undergoes adiabatic epansion, its pressure, P, and volume, V, satisfy the equation P V 1.3 = k, where k is a constant. Find the relationship between the related rates / and /. (In other words find / in terms of /, P, and V.) (b) (10 pts) A particle is moving to the left along the line y = 3. When = 4, the -coordinate of the particle s position is decreasing at the rate of 0.5 cm/sec. At what rate is the distance of the particle from the origin changing at this moment? (a) Method 1: If we assume k is a nonzero constant, then V 0 and solving for P eplicitly yields P = kv 1.3, thus 2.3 = 1.3kV. Method 2: Note that differentiating P V 1.3 = k yields solving for / yields 1.3 V + 1.3V 0.3 P = 0 = V 1.3 = 1.3V 0.3 P 0.3 = 1.3V P V 1.3 = 1.3V 1 P = 1.3P V = 1.3P V Note: In the solution from Method 1, if we substitute k = P V 1.3 we get the solution from Method 2: 2.3 = 1.3kV = 1.3(P V )V = 1.3P V 1 = 1.3P V (b) Note that the distance of any point on the line y = 3 from the origin is given by D = 2 + 9, taking the derivative of both sides with respect to t yields dd = 1 2 (2 + 9) 1/2 2 d = substituting = 4 and d/ = 0.5 cm/sec yields dd = d ( 4 ( 4) ) = 4 ( ) = cm/sec that is, the distance is increasing at 0.4 cm/sec when = The following parts are not related: (a) (10 pts) One leg of a right triangle is known to have length 4 cm. The other leg is measured to be 3 cm with a maimum error of +0.1 cm. Use differentials to estimate the maimum error in the calculation of the angle θ between the measured leg and the hypotenuse. (b) (10 pts) If possible, find all numbers c in the interval [0.5, 2] that satisfy the conclusion of the Mean Value Theorem for the function f() = + 1, justify your answer. (a) We have a number of relationships between the side lengths and the angle θ, but only one that uses the lengths of the known leg and the one with measured error, namely
3 tan θ = 4 Taking derivatives we have sec 2 θ dθ = 4 2 d Solving for dθ we have dθ = cos 2 θ 4 2 d Using the fact that the triangle, as measured, is a triangle we have that cos(θ) = 3/5 which implies that cos 2 θ = 9/25. Plugging in the values for and d we have dθ = = = = (b) The function f is continuous and differentiable at every point ecept = 0, which is not in the interval, the MVT can be applied. We need to find the point c such that f (c) = f(2) f(1/2) 2 (1/2) We first write f as f() = Then f () = 1. We have 2 1 c 2 = 1 + 1/2 (1 + 2) 2 1/2 = 1 c 2 = 1 = c2 = 1 = c = ±1 Since only c = 1 is in [ 1 2, 2], it is the point guaranteed to eist by the MVT. 4. The following parts are not related: (a) (10 pts) Find all local etrema of y = 1 4 on the interval ( 1, 1), justify your answer without graphing the function. (Just give the -value of the etrema, if any.) (b) (10 pts) In your blue book clearly sketch the graph of a function f() that satisfies the following properties (label any etrema, inflection points or asymptotes): f () > 0 if < 2 f () < 0 if > 2 f ( 2) = 0 lim 2 f () = + f () > 0 if 2
4 (a) Note that f () = (1 4 ) 1/2 ( 4 3 ) = = and so f () = 0 when = ± and f () is undefined when = ±1 but these points are not in the domain. So = ± are the critical points of f(). We now need to determine if they are local etrema or just critical points. So we consider the sign chart of f () = , Sign Chart for f () / 4 3 1/ Increasing/Decreasing behavior for f() -1 1/ 4 3 1/ so = 1/ 4 3 is a local minimum and = 1/ 4 3 is a local maimum. Note: One could also use the 2nd Derivative test to determine whether or not the critical points of f() are local etrema or not. (b) Note that f () > 0 if < 2 = f is increasing on ( 2, 2) f () < 0 if > 2 = f is decreasing on (, 2) and (2, ) f ( 2) = 0 = horizontal tangent at = 2 lim 2 f () = + = there is a vertical asymptote or vertical tangent (cusp) at = 2 f () > 0 if 2 = f is concave up on (, 2) and (2, ) implies that the graph could, for eample, look like either of the following graphs below, 5. (20 pts, 4 ea.) Answer either Always True or False. Do NOT justify your answer. Do NOT abbreviate your answer. (a) Using a linearization of at a = 4, we can estimate (b) If f() is continuous on (a, b), then f() attains an absolute maimum value f(c) and an absolute minimum value f(d) at some points c and d in (a, b). (c) If m() is differentiable for all then m () is continuous.
5 sec(t) sec() (d) If k() = lim, then k(π/4) = 2 t t (e) If b() is differentiable and b( 1) = b(1), then there is a number c such that c < 1 and b (c) = 0. (a) F (b) F (c) F (d) A.T. (e) A.T. Comments: (a) Linearizing at a = 4, yields L() = ( 4), thus (b) Consider f() = on the interval (0, 1), then f() does not attain an absolute ma or min in (0, 1). { 2 sin(1/), if 0 (c) Consider m() = then m () eists for all but is not continuous at = 0. 0, if = 0 sec(t) sec() (d) Note lim = d t t t= [sec(t)] = sec() tan() = f(), so k(π/4) = sec(π/4) tan(π/4) = 2 (e) Use the Mean Value Theorem on b() over the interval [ 1, 1].
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