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MTH 33 Exam 2 April th, 208 Name: Section: Recitation Instructor: INSTRUCTIONS Fill in your name, etc. on this first page. Without fully opening the exam, check that you have pages through 2. Show all your work on the standard response questions. Write your answers clearly! Include enough steps for the grader to be able to follow your work. Don t skip limits or equal signs, etc. Include words to clarify your reasoning. Do first all of the problems you know how to do immediately. Do not spend too much time on any particular problem. Return to difficult problems later. If you have any questions please raise your hand. You will be given exactly 90 minutes for this exam. Remove and utilize the formula sheet provided to you at the end of this exam. ACADEMIC HONESTY Do not open the exam booklet until you are instructed to do so. Do not seek or obtain any kind of help from anyone to answer questions on this exam. If you have questions, consult only the proctor(s). Books, notes, calculators, phones, or any other electronic devices are not allowed on the exam. Students should store them in their backpacks. No scratch paper is permitted. If you need more room use the back of a page. You must indicate if you desire work on the back of a page to be graded. Anyone who violates these instructions will have committed an act of academic dishonesty. Penalties for academic dishonesty can be very severe. All cases of academic dishonesty will be reported immediately to the Dean of Undergraduate Studies and added to the student s academic record. I have read and understand the above instructions and statements regarding academic honesty:. SIGNATURE Page of 2

MTH 33 Exam 2 April th, 208 Standard Response Questions. Show all work to receive credit. Please BOX your final answer.. Determine if the following series converge or diverge. If the series converges, also compute the sum. You must show all of your work and support your conclusions. 3 n+ (a) (7 points) 4 n (b) (7 points) n 2 5n 2 + 4 Page 2 of 2

MTH 33 Exam 2 April th, 208 2. Determine if the following series converge or diverge. You must show all of your work and justify your use of any series convergence tests. n 5 (a) (7 points) 5 n (b) (7 points) 2 n Page 3 of 2

MTH 33 Exam 2 April th, 208 3. For each of the following functions, find its 3rd degree Taylor polynomial centered at the given a. (a) (7 points) f(x) = e 5x, centered at a = 0. (b) (7 points) g(x) = ln(x), centered at a =. Page 4 of 2

MTH 33 Exam 2 April th, 208 4. (7 points) Find the Maclaurin series (Taylor series centered at a = 0) representation of f(x) = Express your answer in sigma notation. x + 9x 2. (3x 5) n 5. (7 points) Find the interval of convergence for the power series. (Leave your answer as n 2 n=3 an open interval; you do not have to test the end points for convergence.) Page 5 of 2

MTH 33 Exam 2 April th, 208 Multiple Choice. Circle the best answer. No work needed. No partial credit available. 6. (4 points) Find the limit of the sequence a n where the n th term is given by a n = A. 0 B. 3 4 C. 3 D. 4 E. The sequence diverges 3 sin 4n 4n. 7. (4 points) Which statement about the series 2n2 + 4n n 3 + is true? A. It diverges by using the limit comparison test with n. B. It converges by using the limit comparison test with n. C. It diverges by using the limit comparison test with n. 2 D. It converges by using the limit comparison test with E. It diverges by the ratio test. n 2. 8. (4 points) Which statement is true about the series A. The integral test shows that the series converges. B. The integral test shows that the series diverges. 0 n(ln(n) + ) 3? C. The integral test hypotheses are not met by this series, so it cannot be applied. D. The integral test hypotheses are met by this series, however the test is inconclusive. E. None of the above are true. Page 6 of 2

MTH 33 Exam 2 April th, 208 9. (4 points) Find the radius of convergence of A. /4 B. /3 C. 3 D. 4 E. + (4x + 7) 3n+. n! 0. (4 points) Determine whether the following series are absolutely convergent, conditionally convergent, or divergent: () cos n n 2 + and (2) ( ) n 2n A. () is absolutely convergent; (2) is divergent. B. () is conditionally convergent; (2) is divergent. C. () is absolutely convergent; (2) is conditionally convergent. D. () is divergent; (2) is conditionally convergent. E. Both () and (2) are conditionally convergent.. (4 points) Which statement is true about the series A. By the ratio test, the series converges. B. By the ratio test, the series diverges. ln(7n) n 3? C. The ratio test is inconclusive for this series, but the series converges by another test. D. The ratio test is inconclusive for this series, but the series diverges by another test. E. None of the above are true. Page 7 of 2

MTH 33 Exam 2 April th, 208 2. (4 points) Which of the following series converge? () 2n (2) ( ) n n + (3) n 2 + A. All three. B. Only () and (2). C. Only (3). D. Only (2) and (3). E. None. 3. (4 points) The Taylor series of the function f(x), centered at a = 2, is given by What is the value of the third derivative f (2)? n 2 n + (x 2) n. n! A. B. 3/2 C. 3 D. 7/6 E. 7 4. (4 points) The first 4 nonzero terms of the Taylor series, centered at a = 0, for f(x) = 0x cos x 2+5x 3 are A. 2 + 0x 0x2 2! B. 0x 0x3 2! + 0x5 4! C. 2 + 0x 0x3 2! D. 2 + 0x + 0x5 4! E. 2 + 0x 3 0x5 4! + 0x4 4! 0x7 6! + 0x5 4! 0x7 6! + 0x7 6! Page 8 of 2

MTH 33 Exam 2 April th, 208 More Challenging Questions. Show all work to receive credit. Please BOX your final answer. 5. (a) (4 points) Give an example of a series that converges but does not converge absolutely; and give a brief justification. (b) (4 points) Give an example of a convergent series where the ratio test is inconclusive; and give a brief justification. 6. (6 points) Which is larger: x dx or? Explain. 3/2 n3/2 Page 9 of 2

MTH 33 Exam 2 April th, 208 DO NOT WRITE BELOW THIS LINE. Page Points Score 2 4 3 4 4 4 5 4 6 2 7 2 8 2 9 4 Total: 06 No more than 00 points may be earned on the exam. Page 0 of 2

MTH 33 Exam 2 April th, 208 Integrals FORMULA SHEET PAGE Derivatives Volume: Suppose A(x) is the cross-sectional area of the solid S perpendicular to the x-axis, then the volume of S is given by d d (sinh x) = cosh x dx Inverse Trigonometric Functions: (cosh x) = sinh x dx V = b a A(x) dx d dx (sin x) = x 2 d dx (csc x) = x x 2 Work: Suppose f(x) is a force function. The work in moving an object from a to b is given by: W = b dx = ln x + C x tan x dx = ln sec x + C a f(x) dx sec x dx = ln sec x + tan x + C a x dx = ax ln a + C for a Integration by Parts: u dv = uv Arc Length Formula: v du d dx (cos x) = x 2 d dx (tan x) = d dx (sec x) = d + x 2 dx (cot x) = x x 2 + x 2 If f is a one-to-one differentiable function with inverse function f and f (f (a)) 0, then the inverse function is differentiable at a and (f ) (a) = f (f (a)) Hyperbolic and Trig Identities Hyperbolic Functions sinh(x) = ex e x 2 cosh(x) = ex + e x 2 csch(x) = sinh x sech(x) = cosh x L = b a + [f (x)] 2 dx tanh(x) = sinh x cosh x cosh 2 x sinh 2 x = sin 2 x = 2 ( cos 2x) cos 2 x = 2 ( + cos 2x) sin(2x) = 2 sin x cos x coth(x) = cosh x sinh x sin A cos B = 2 [sin(a B) + sin(a + B)] sin A sin B = 2 [cos(a B) cos(a + B)] cos A cos B = 2 [cos(a B) + cos(a + B)] Page of 2

MTH 33 Exam 2 April th, 208 FORMULA SHEET PAGE 2 Series nth term test for divergence: If lim a n does n not exist or if lim a n 0, then the series a n n is divergent. The p-series: and divergent if p. Geometric: If r < then is convergent if p > np ar n = a r The Integral Test: Suppose f is a continuous, positive, decreasing function on [, ) and let a n = f(n). Then (i) If (ii) If then then f(x) dx is convergent, a n is convergent. f(x) dx is divergent, a n is divergent. The Comparison Test: Suppose that a n and b n are series with positive terms. (i) If b n is convergent and a n b n for all n, then a n is also convergent. (ii) If b n is divergent and a n b n for all n, then a n is also divergent. The Limit Comparison Test: Suppose that an and b n are series with positive terms. If a n lim = c n b n where c is a finite number and c > 0, then either both series converge or both diverge. Alternating Series Test: If the alternating series ( ) n b n satisfies (i) 0 < b n+ b n (ii) lim b n = 0 n for all n then the series is convergent. The Ratio Test (i) If lim a n+ n a n = L <, then the series a n is absolutely convergent. (ii) If lim a n+ n a n = L > or lim a n+ n a n =, then the series a n is divergent. (iii) If lim a n+ n a n =, the Ratio Test is inconclusive. f (n) (0) Maclaurin Series: f(x) = n! x n Taylor s Inequality If f (n+) (x) M for x a d, then the remainder R n (x) of the Taylor series satisfies the inequality R n (x) M (n + )! x a n+ for x a d Some Power Series e x x n = n! sin x = cos x = ( ) n x2n+ (2n + )! ln( + x) = ( ) n x2n (2n)! ( ) n xn n R = R = R = R = x = x n R = Page 2 of 2