Math 201-203-RE: Fall 2009 Final Exam Solutions, Exams of Calculus

The solutions to the math 201-203-re final exam held in fall 2009. It includes answers to various math problems involving integration, differentiation, logarithms, and series. The problems are labeled with numbers (1 to 17) and include both calculus and algebraic questions.

Typology: Exams

2012/2013

Uploaded on 02/27/2013

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Math 201-203-RE - Final Exam Fall 2009 Page 1 of 2
ANSWERS
(1 a) xฯ€+1
ฯ€+1 โˆ’ln |secx|+ฯ€x
ln ฯ€โˆ’x+C; (1 b) 1
2x2+ ln |x2+xโˆ’2|+C; (1 c) 175
4= 43.75
(1 d) 2 (โˆšx+ 4) โˆ’8 ln (โˆšx+ 4) + C= 2โˆšxโˆ’8 ln (โˆšx+ 4) + C
(1 e) โˆ’x2cos x+ 2xsin x+ 2 cos x+C; (1 f ) ln |x| โˆ’ 3
xโˆ’2 ln |x+ 4|+C
(2 a) factor then F39 or complete square then F26: ln ๎˜Œ
๎˜Œ
๎˜Œx+ 2 + โˆšx2+ 4xโˆ’5๎˜Œ
๎˜Œ
๎˜Œ+C
(2 b) substitution then F12: โˆ’1
12 ln ๎˜Œ
๎˜Œ
๎˜Œ
๎˜Œ
x2โˆ’1
x2+ 5๎˜Œ
๎˜Œ
๎˜Œ
๎˜Œ
+C
(3)
x
y
g(x) = x2
โˆ’2x
f(x) = 4xโˆ’x2+ 8
0
โˆ’12 4
12
โˆ’1
b
b
b
b
Area = 125
3โ‰ˆ41.67 square units
(4 a) point of equilibrium: (2,44)
(4 b)
p(x)
x
p=x2+ 16x+ 8
p= 48 โˆ’x2
P.S.
C.S.
44
8
48
2 6.90
b
b
b
b
(4 c) P.S.=37.33
(5) 6.6705 ; (6 a) y=1
5x5+1
4e2x+1
2x+15
4; (6 b) y=xln xโˆ’x+ 6
7(a) y=3
q3
4xโˆ’3 ln(x) + C; (7 b) y=Cโˆšx2+ 1 ; (8 a) about 25 persons ; (8 b) about 5.4 weeks
pf2

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Math 201-203-RE - Final Exam Fall 2009 Page 1 of 2

ANSWERS

(1 a)

xฯ€+ ฯ€+

โˆ’ ln |secx| +

ฯ€x ln ฯ€

โˆ’ x + C ; (1 b)

1 2

x

2

  • ln |x

2

  • x โˆ’ 2 | + C ; (1 c)

175 4

(1 d) 2 (

x + 4) โˆ’ 8 ln (

x + 4) + C = 2

x โˆ’ 8 ln (

x + 4) + C

(1 e) โˆ’x

2 cos x + 2x sin x + 2 cos x + C ; (1 f) ln |x| โˆ’

3 x โˆ’^ 2 ln^ |x^ + 4|^ +^ C

(2 a) factor then F39 or complete square then F26: ln

โˆฃx^ + 2 +^

x^2 + 4x โˆ’ 5

โˆฃ +^ C

(2 b) substitution then F12: โˆ’

1 12

ln

x

2 โˆ’ 1

x^2 + 5

+ C

x

y

g(x) = x

2 โˆ’ 2 x

f (x) = 4x โˆ’ x^2 + 8

โˆ’ 1 0 2 4

12

โˆ’ 1

b

b

b

b

Area =

125 3

โ‰ˆ 41 .67 square units

(4 a) point of equilibrium: (2, 44)

(4 b)

p(x)

x

p = x

2

  • 16x + 8

p = 48 โˆ’ x^2

P.S.

C.S. 44

8

48

0 2 6.

b

b

b

b

(4 c) P.S.=37. 33

(5) 6.6705 ; (6 a) y =

1 5

x^5 +

1 4

e^2 x^ +

1 2

x +

15 4

; (6 b) y = x ln x โˆ’ x + 6

7(a) y =

3

3 4

x โˆ’ 3 ln(x) + C ; (7 b) y = C

x^2 + 1 ; (8 a) about 25 persons ; (8 b) about 5.4 weeks

Math 201-203-RE - Final Exam Fall 2009 Page 2 of 2

(9 a) โˆ’

1 6 ; (9 b)^ โˆ’โˆž^ ; (10 a)^ โˆ’โˆž^ , divergent ; (10 b) converges to^ โˆ’^

3 2

(11 a) a 5 =

25 5

, a 6 =

29 6

, a 7 =

33 7

, a 8 =

37 8

; (11 b) an =

4 n + 5

n

; (11 c) converges to 4

(12) the first 6 terms are: 1 , 3 , 5 , 7 , 9 , 11 ; an = 2n โˆ’ 1 ; (13) an = (โˆ’1)

n+1 n!

5 n

(14 a) ยฑ

5 3

, divergent ; (14 b) converges to 1 ; (15) $2188. 10

(16 a) divergent by n.T.T. ; (16 b) convergent by geometric test to

9 2 ; (17) $1975.^90