Calc 2 - Exam 2

This practice page is modeled after the exam topics from the uploaded test. It includes the original-style problem set plus 40 additional practice problems that are similar in style but not identical.

Single-file GitHub Pages HTML MathJax enabled 50 total problems Difficulty varies intentionally
Difficulty note: The difficulty varies across the set. Some problems are straightforward review, while others are harder and are meant to feel more like exam-level integration, inverse trig, logarithmic differentiation, or improper integral problems.

Exam-Style Directions

Read first

Problems 1-5: Work each problem.

Problems 6-10: These are integration and improper integral style problems modeled after the original exam.

Extra Practice 11-50: Similar topics, but not exact repeats. Difficulty varies.

Formula Sheet: Included at the bottom of this page for quick review.

Original Exam-Inspired Set

Problems 1-10

Problem 1

Compute \(\dfrac{dy}{dx}\) for each:

(a) \(y = 6x + \ln(2x+5) + \tan^{-1}(\cosh x)\)

(b) \(y = \sin(x^x)\)

Difficulty: varies, about 3/5 to 4/5

Problem 2

Compute the following limits if they exist:

(a) \(\displaystyle \lim_{x\to 0} \frac{1-\cos(3x)}{2x^2+x-\sin x}\)

(b) Find the value of \(A\) so that L'Hospital's Rule applies, then compute

\(\displaystyle \lim_{x\to 3} \frac{x^2-2x+A}{2x-6}\)

Difficulty: about 3/5

Problem 3

Compute each:

(a) \(\sin(\arcsin(-1))\)

(b) \(\arcsin(\sin(2\pi))\)

(c) \(\arctan(\cos \pi)\)

(d) \(\arcsin\!\left(\cos\!\left(\frac{\pi}{3}\right)\right)\)

(e) \(\arcsin(\cos \pi)\)

Difficulty: about 2/5 to 3/5

Problem 4

A bacteria population grows according to \(P(t)=200e^{2t}\), where \(t\) is in days.

Find the initial population, when the population reaches 1000, and the rate of change after 3 days.

Difficulty: about 2/5 to 3/5

Problem 5

Complete the identity using the triangle method:

\(\cos(\sin^{-1}(3x))\)

Difficulty: about 3/5
Integration block directions (modeled after the exam): Treat Problems 6-10 as the core integration and improper integral portion. Difficulty varies across these problems.

Problem 6

Evaluate:

\(\displaystyle \int x^2\cos(3x)\,dx\)

Difficulty: about 4/5

Problem 7

Evaluate:

\(\displaystyle \int \cos^6(x)\sin^3(x)\,dx\)

Difficulty: about 4/5

Problem 8

Evaluate:

\(\displaystyle \int \frac{x^2}{\sqrt{9-x^2}}\,dx\)

Difficulty: about 3/5

Problem 9

Evaluate:

\(\displaystyle \int \frac{5x-2}{x(x^2+1)}\,dx\)

Difficulty: about 3/5

Problem 10

Determine whether the integral converges or diverges. If it converges, find its value:

\(\displaystyle \int_0^{\infty} \frac{x^4}{(1+x^5)^2}\,dx\)

Difficulty: about 4/5 to 5/5

40 Additional Practice Problems

Problems 11-50
Derivative, limits, inverse trig, and exponential growth (11-20)

11

Compute \(\dfrac{dy}{dx}\): \(y = 4x + \ln(5x-1) + \tan^{-1}(\sinh x)\)

Difficulty: 3/5

12

Compute \(\dfrac{dy}{dx}\): \(y = \cos(x^x)\)

Difficulty: 4/5

13

Compute \(\displaystyle \lim_{x\to 0} \frac{1-\cos(4x)}{x^2}\)

Difficulty: 2/5

14

Find \(A\) so that L'Hospital's Rule applies, then compute \(\displaystyle \lim_{x\to 2} \frac{x^2-5x+A}{x-2}\).

Difficulty: 3/5

15

Compute: \(\sin(\arcsin(1/2))\)

Difficulty: 2/5

16

Compute: \(\arcsin(\sin(5\pi/6))\)

Difficulty: 3/5

17

Compute: \(\arctan(\cos 0)\)

Difficulty: 2/5

18

Use the triangle method to simplify \(\sin(\tan^{-1}(2x))\).

Difficulty: 3/5

19

A population grows according to \(P(t)=350e^{1.5t}\). Find the initial population and when it reaches 2000.

Difficulty: 2/5 to 3/5

20

For \(P(t)=120e^{0.8t}\), find \(P'(t)\) and then compute \(P'(4)\).

Difficulty: 2/5
Integration by parts and trig integrals (21-30)

21

Evaluate: \(\displaystyle \int x e^{2x}\,dx\)

Difficulty: 3/5

22

Evaluate: \(\displaystyle \int x^2 \sin(2x)\,dx\)

Difficulty: 4/5

23

Evaluate: \(\displaystyle \int x\ln x\,dx\)

Difficulty: 3/5

24

Evaluate: \(\displaystyle \int e^x\cos x\,dx\)

Difficulty: 4/5

25

Evaluate: \(\displaystyle \int \sin^3(x)\cos^4(x)\,dx\)

Difficulty: 3/5

26

Evaluate: \(\displaystyle \int \cos^5(x)\sin^2(x)\,dx\)

Difficulty: 3/5

27

Evaluate: \(\displaystyle \int \sin^2(x)\cos^2(x)\,dx\)

Difficulty: 4/5

28

Evaluate: \(\displaystyle \int \sec^3(x)\,dx\)

Difficulty: 3/5

29

Evaluate: \(\displaystyle \int \sec(x)\tan(x)\,dx\)

Difficulty: 2/5

30

Evaluate: \(\displaystyle \int \csc(x)\cot(x)\,dx\)

Difficulty: 2/5
Trig substitution and partial fractions (31-40)

31

Evaluate: \(\displaystyle \int \frac{dx}{\sqrt{16-x^2}}\)

Difficulty: 3/5

32

Evaluate: \(\displaystyle \int \frac{x^2}{\sqrt{25-x^2}}\,dx\)

Difficulty: 3/5 to 4/5

33

Evaluate: \(\displaystyle \int \frac{dx}{x\sqrt{x^2-9}}\)

Difficulty: 4/5

34

Evaluate: \(\displaystyle \int \sqrt{9-x^2}\,dx\)

Difficulty: 4/5

35

Evaluate: \(\displaystyle \int \frac{3x+5}{x(x+2)}\,dx\)

Difficulty: 3/5

36

Evaluate: \(\displaystyle \int \frac{2x+7}{x^2+x-6}\,dx\)

Difficulty: 3/5

37

Evaluate: \(\displaystyle \int \frac{x^2+1}{x(x-1)(x+1)}\,dx\)

Difficulty: 4/5

38

Evaluate: \(\displaystyle \int \frac{5}{x^2-4}\,dx\)

Difficulty: 3/5

39

Evaluate: \(\displaystyle \int \frac{4x-1}{x(x^2+4)}\,dx\)

Difficulty: 4/5

40

Evaluate: \(\displaystyle \int \frac{dx}{x^2-9}\)

Difficulty: 3/5
Improper integrals and mixed review (41-50)

41

Determine whether \(\displaystyle \int_1^{\infty} \frac{1}{x^2}\,dx\) converges or diverges. If it converges, find its value.

Difficulty: 2/5

42

Determine whether \(\displaystyle \int_1^{\infty} \frac{1}{x}\,dx\) converges or diverges.

Difficulty: 2/5

43

Determine whether \(\displaystyle \int_0^{1} \frac{1}{\sqrt{x}}\,dx\) converges or diverges. If it converges, find its value.

Difficulty: 2/5

44

Determine whether \(\displaystyle \int_0^{\infty} e^{-x}\,dx\) converges or diverges. If it converges, find its value.

Difficulty: 2/5

45

Determine whether \(\displaystyle \int_1^{\infty} \frac{1}{x^{3/2}}\,dx\) converges or diverges. If it converges, find its value.

Difficulty: 3/5

46

Determine whether \(\displaystyle \int_1^{\infty} \frac{dx}{x^{4/5}}\) converges or diverges.

Difficulty: 3/5

47

Evaluate: \(\displaystyle \int_0^{\infty} \frac{3}{(1+3x)^2}\,dx\)

Difficulty: 3/5

48

Evaluate: \(\displaystyle \int_2^{\infty} \frac{1}{x\ln x}\,dx\) or determine divergence.

Difficulty: 4/5

49

Evaluate: \(\displaystyle \int \cos(\ln x)\,dx\)

Difficulty: 4/5

50

Evaluate: \(\displaystyle \int \sin(\ln(2x))\,dx\)

Difficulty: 4/5

Answer Key

Hidden dropdowns

Use the dropdowns below only after attempting the problems yourself.

Problems 1-10 answers

1(a) \(y' = 6 + \dfrac{2}{2x+5} + \dfrac{\sinh x}{1+\cosh^2 x}\)

1(b) \(y' = \cos(x^x)\,x^x(\ln x + 1)\)

2(a) \(\dfrac{9}{2}\)

2(b) \(A=-3\), and the limit is \(2\)

3(a) \(-1\)

3(b) \(0\)

3(c) \(-\pi/4\)

3(d) \(\pi/6\)

3(e) does not exist in the real numbers since \(\arcsin(-1)= -\pi/2\) but here the input is \(\cos\pi=-1\), so the value is actually \(-\pi/2\)

4 Initial population \(=200\). Time to reach 1000: \(t=\frac{\ln 5}{2}\). Rate after 3 days: \(P'(3)=400e^6\)

5 \(\sqrt{1-9x^2}\)

6 \(\displaystyle \frac{x^2\sin(3x)}{3}+\frac{2x\cos(3x)}{9}-\frac{2\sin(3x)}{27}+C\)

7 \(\displaystyle \frac{\cos^9 x}{9}-\frac{2\cos^{11}x}{11}+\frac{\cos^{13}x}{13}+C\)

8 \(\displaystyle \frac{9}{2}\arcsin\!\left(\frac{x}{3}\right)-\frac{x}{2}\sqrt{9-x^2}+C\)

9 \(\displaystyle -2\ln|x|+\frac{9}{2}\ln(x^2+1)-2\arctan(x)+C\)

10 Converges to \(\dfrac{1}{5}\)

Problems 11-20 answers

11 \(y' = 4 + \dfrac{5}{5x-1} + \dfrac{\cosh x}{1+\sinh^2 x}\)

12 \(y' = -\sin(x^x)\,x^x(\ln x+1)\)

13 \(8\)

14 \(A=6\), limit \(=-1\)

15 \(1/2\)

16 \(\pi/6\)

17 \(\pi/4\)

18 \(\dfrac{2x}{\sqrt{1+4x^2}}\)

19 Initial population \(=350\), reaching 2000 at \(t=\dfrac{1}{1.5}\ln\!\left(\dfrac{40}{7}\right)\)

20 \(P'(t)=96e^{0.8t}\), so \(P'(4)=96e^{3.2}\)

Problems 21-30 answers

21 \(\displaystyle \frac{1}{2}xe^{2x}-\frac{1}{4}e^{2x}+C\)

22 \(\displaystyle -\frac{x^2\cos(2x)}{2}+\frac{x\sin(2x)}{2}+\frac{\cos(2x)}{4}+C\)

23 \(\displaystyle \frac{x^2}{2}\ln x-\frac{x^2}{4}+C\)

24 \(\displaystyle \frac{e^x(\sin x+\cos x)}{2}+C\)

25 \(\displaystyle \frac{\cos^7 x}{7}-\frac{\cos^5 x}{5}+C\)

26 \(\displaystyle \frac{\sin^3 x}{3}-\frac{2\sin^5 x}{5}+\frac{\sin^7 x}{7}+C\)

27 \(\displaystyle \frac{x}{8}-\frac{\sin(4x)}{32}+C\)

28 \(\displaystyle \frac12\sec x\tan x+\frac12\ln|\sec x+\tan x|+C\)

29 \(\sec x + C\)

30 \(-\csc x + C\)

Problems 31-40 answers

31 \(\arcsin(x/4)+C\)

32 \(\displaystyle \frac{25}{2}\arcsin\!\left(\frac{x}{5}\right)-\frac{x}{2}\sqrt{25-x^2}+C\)

33 \(\displaystyle \frac{1}{3}\sec^{-1}\!\left(\frac{|x|}{3}\right)+C\)

34 \(\displaystyle \frac{x}{2}\sqrt{9-x^2}+\frac{9}{2}\arcsin\!\left(\frac{x}{3}\right)+C\)

35 \(\displaystyle \frac{5}{2}\ln|x|+\frac{1}{2}\ln|x+2|+C\)

36 \(\displaystyle \frac{11}{5}\ln|x-2|-\frac{1}{5}\ln|x+3|+C\)

37 \(\ln|x|-\frac{1}{x-1}+\frac{1}{x+1}+C\)

38 \(\displaystyle \frac{5}{4}\ln\left|\frac{x-2}{x+2}\right|+C\)

39 \(\displaystyle -\frac14\ln|x|+\frac18\ln(x^2+4)+\frac72\arctan(x/2)+C\)

40 \(\displaystyle \frac{1}{6}\ln\left|\frac{x-3}{x+3}\right|+C\)

Problems 41-50 answers

41 Converges to \(1\)

42 Diverges

43 Converges to \(2\)

44 Converges to \(1\)

45 Converges to \(2\)

46 Diverges

47 Converges to \(1\)

48 Diverges

49 \(\displaystyle \frac{x}{2}(\sin(\ln x)+\cos(\ln x))+C\)

50 \(\displaystyle \frac{x}{2}(\sin(\ln(2x))-\cos(\ln(2x)))+C\)

Answer Key

Hidden dropdowns

Use the dropdowns below only after attempting the problems yourself.

Problems 1-10 answers

1(a) \\(y' = 6 + \\dfrac{2}{2x+5} + \\dfrac{\\sinh x}{1+\\cosh^2 x}\\)

1(b) \\(y' = \\cos(x^x)\\,x^x(\\ln x + 1)\\)

2(a) \\(\\dfrac{9}{2}\\)

2(b) \\(A=-3\\), and the limit is \\(2\\)

3(a) \\(-1\\)

3(b) \\(0\\)

3(c) \\(-\\pi/4\\)

3(d) \\(\\pi/6\\)

3(e) \\(-\\pi/2\\)

4 Initial population \\(=200\\). Time to reach 1000: \\(t=\\frac{\\ln 5}{2}\\). Rate after 3 days: \\(P'(3)=400e^6\\)

5 \\(\\sqrt{1-9x^2}\\)

6 \\(\\displaystyle \\frac{x^2\\sin(3x)}{3}+\\frac{2x\\cos(3x)}{9}-\\frac{2\\sin(3x)}{27}+C\\)

7 \\(\\displaystyle \\frac{\\cos^7 x}{7}-\\frac{2\\cos^9 x}{9}+\\frac{\\cos^{11}x}{11}+C\\)

8 \\(\\displaystyle \\frac{9}{2}\\arcsin\\!\\left(\\frac{x}{3}\\right)-\\frac{x}{2}\\sqrt{9-x^2}+C\\)

9 \\(\\displaystyle -2\\ln|x|+\\frac{9}{2}\\ln(x^2+1)-2\\arctan(x)+C\\)

10 Converges to \\(\\dfrac{1}{5}\\)

Problems 11-20 answers

11 \\(y' = 4 + \\dfrac{5}{5x-1} + \\dfrac{\\cosh x}{1+\\sinh^2 x}\\)

12 \\(y' = -\\sin(x^x)\\,x^x(\\ln x+1)\\)

13 \\(8\\)

14 \\(A=6\\), limit \\(=-1\\)

15 \\(1/2\\)

16 \\(\\pi/6\\)

17 \\(\\pi/4\\)

18 \\(\\dfrac{2x}{\\sqrt{1+4x^2}}\\)

19 Initial population \\(=350\\), reaching 2000 at \\(t=\\dfrac{1}{1.5}\\ln\\!\\left(\\dfrac{40}{7}\\right)\\)

20 \\(P'(t)=96e^{0.8t}\\), so \\(P'(4)=96e^{3.2}\\)

Problems 21-30 answers

21 \\(\\displaystyle \\frac{1}{2}xe^{2x}-\\frac{1}{4}e^{2x}+C\\)

22 \\(\\displaystyle -\\frac{x^2\\cos(2x)}{2}+\\frac{x\\sin(2x)}{2}+\\frac{\\cos(2x)}{4}+C\\)

23 \\(\\displaystyle \\frac{x^2}{2}\\ln x-\\frac{x^2}{4}+C\\)

24 \\(\\displaystyle \\frac{e^x(\\sin x+\\cos x)}{2}+C\\)

25 \\(\\displaystyle \\frac{\\cos^5 x}{5}-\\frac{\\cos^7 x}{7}+C\\)

26 \\(\\displaystyle \\frac{\\sin^3 x}{3}-\\frac{2\\sin^5 x}{5}+\\frac{\\sin^7 x}{7}+C\\)

27 \\(\\displaystyle \\frac{x}{8}-\\frac{\\sin(4x)}{32}+C\\)

28 \\(\\displaystyle \\frac12\\sec x\\tan x+\\frac12\\ln|\\sec x+\\tan x|+C\\)

29 \\(\\sec x + C\\)

30 \\(-\\csc x + C\\)

Problems 31-40 answers

31 \\(\\arcsin(x/4)+C\\)

32 \\(\\displaystyle \\frac{25}{2}\\arcsin\\!\\left(\\frac{x}{5}\\right)-\\frac{x}{2}\\sqrt{25-x^2}+C\\)

33 \\(\\displaystyle \\frac{1}{3}\\sec^{-1}\\!\\left(\\frac{|x|}{3}\\right)+C\\)

34 \\(\\displaystyle \\frac{x}{2}\\sqrt{9-x^2}+\\frac{9}{2}\\arcsin\\!\\left(\\frac{x}{3}\\right)+C\\)

35 \\(\\displaystyle \\frac{5}{2}\\ln|x|+\\frac{1}{2}\\ln|x+2|+C\\)

36 \\(\\displaystyle \\frac{11}{5}\\ln|x-2|-\\frac{1}{5}\\ln|x+3|+C\\)

37 \\(\\ln|x|-\\frac{1}{x-1}+\\frac{1}{x+1}+C\\)

38 \\(\\displaystyle \\frac{5}{4}\\ln\\left|\\frac{x-2}{x+2}\\right|+C\\)

39 \\(\\displaystyle -\\frac14\\ln|x|+\\frac18\\ln(x^2+4)+\\frac72\\arctan(x/2)+C\\)

40 \\(\\displaystyle \\frac{1}{6}\\ln\\left|\\frac{x-3}{x+3}\\right|+C\\)

Problems 41-50 answers

41 Converges to \\(1\\)

42 Diverges

43 Converges to \\(2\\)

44 Converges to \\(1\\)

45 Converges to \\(2\\)

46 Diverges

47 Converges to \\(1\\)

48 Diverges

49 \\(\\displaystyle \\frac{x}{2}(\\sin(\\ln x)+\\cos(\\ln x))+C\\)

50 \\(\\displaystyle \\frac{x}{2}(\\sin(\\ln(2x))-\\cos(\\ln(2x)))+C\\)

Formula Sheet

Quick review
\(\sin^2(x)=\frac{1}{2}(1-\cos(2x))\)
\(\cos^2(x)=\frac{1}{2}(1+\cos(2x))\)
\(\sin(2x)=2\sin(x)\cos(x)\)
\(\sin^2(x)+\cos^2(x)=1\)
\(1+\tan^2(x)=\sec^2(x)\)
\(\displaystyle \int \sec(x)\,dx = \ln|\sec(x)+\tan(x)|+C\)
\(\displaystyle \int \sec^3(x)\,dx = \frac12\sec(x)\tan(x)+\frac12\ln|\sec(x)+\tan(x)|+C\)
\(\displaystyle \int \csc(x)\,dx = \ln|\csc(x)-\cot(x)|+C\)

Study Notes

  • Difficulty varies on purpose. This is not a uniform set.
  • The hardest problems are mostly in integration by parts, trig integrals, trig substitution, partial fractions, and improper integrals.
  • For the improper integrals, always identify where the problem becomes improper before evaluating.
  • For any substitution problem, keep your preferred habit of back-substituting before final evaluation.