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Unformatted text preview: page 1 Your Name: Circle your TA’s name: LingLAmQrim Jon Gsthall Ed Hanson
Elizabeth Mihalek Rob Owen Kim Schattner
Mathematics 222, Spring 2007 Lecture 3 (Wilson) Final Exam May 17, 2007 There is a problem on the back of this sheet! Do not accidentally skip over it! Write your answers to the ten problems in the spaces provided. If you must continue an answer
somewhere other than immediately after the problem statement, be sure (a) to tell where to look for
the answer, and (b) to label the answer wherever it winds up. In any case, be sure to make clear
what is your ﬁnal answer to each problem. Wherever possible, leave your answers in exact forms (using g, VS, cos(0.6), and similar numbers)
rather than using decimal approximations. For example, sin(%) 2 %, and writing something like .499 may not get you full credit. If you use a calculator to evaluate your answer be sure to show what you were evaluating!
There is scratch paper at the end of this exam. If you need more scratch paper, please ask for it. You may refer to notes you have brought on up to three sheets of paper, and the class handout on
undetermined coefﬁcients, as announced in class and by email. BE SURE TO SHOW YOUR WORK, AND EXPLAIN WHAT YOU DID. YOU MAY RECEIVE
REDUCED OR ZERO CREDIT FOR UNSUBSTANTIATED ANSWERS. (“I did it on my calcula 97 tor and “I used a formula from the book” (without more details) are not sufﬁcient substantiation...) Problem Points Score
1 15
2 20
3 20
4 21
5 20
6 21
7 20
8 21
9 21
10 21 TOTAL 200 Page 2 Problem 1 l 15 points l For each of the following equations, indicate its graph by ﬁlling in the blank with the number from the
picture below. (80— r=1+si116 (d) fig—91:0 Problem 2 {20 points } Evaluate the integrals: (a) /1;2 cos(1;) dx (b) /tan3 dx Problem 3 {20 points } Evaluate the integrals: (a) /0§ Wake Page 4 Page 5 Problem 4 {21 points l For each of the following series, tell whether it converges or diverges. If it converges and it has some positive and some negative terms, tell whether it converges absolutely or conditionally. Be sure to give
reasons justifying your answers. Page 6 Problem 5 {20 points l Find the Taylor series at a = 1 for f = cos(a:2 — 1). Show the terms through the 3”l degree terrn.
Derive the coefﬁcients from the general form for Taylor series, do not just “plug in” to some known series. That is you should calculate a0, a1 a2, and (13 using derivatives, and show how they are ﬁtted into a
third—degree polynomial. Problem 6 {21 points l Find all solutions of the differential equation y” + 2y' +y = 6sin12xl. Problem 7 {20 points l Let qr = 2r+ j+ k: and 27: r 2j+ 21?. (a) What is 17, the magnitude of 17? (b) What is the cos 6, if 6 is the angle between i? and 17? (c) What is the scalar component of 17 in the direction of 17? (d) What is projgﬁ, the projection of 17 on 17? —» (e) Find two vectors {[1 and 712 such that 11’ = {[1 +u2, (ii) 171 is parallel to 17, and (iii) {[2 is orthogonal
toJZ EM
Problem 8 {21 points}
Suppose the polynomial 1 — 323—: is used to calculate, approximately, cos(1;). If this will be used for
values of a: from —1 to 1, what accuracy can you guarantee will be achieved?
Your answer should use the remainder term from Taylor’s theorem in showing your answer is valid. If you
know another mathematically correct way to do the problem you can use that as a check on your answer
and get up to 5 extra points. But it will not substitute for an answer using Taylor’s theorem. Page 10 Problem 9 {21 points } Solve the initial value problem d
x—y+2y=$3 dw (for x > 0) and y(2) = 1. Page 11 Problem 10 (21 points)
Consider two planes, H1 and H2, given by H1: $+22[—Z=7
and H1: 2w+3y+22=4. (a) Find parametric equations for the line of intersection of these two planes.
Hint: The point (1, 2, —2) is on both planes. (b) The angle between two planes means the angle between a vector perpendicular to one plane and a
vector perpendicular to the other. What is the cosine of the angle between H1 and H2? page 12 \ ko‘
\é Scratch Pa er (not a command!) ...
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 Spring '08
 Wilson

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