Calculus 2 - Trig Identities

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32 Terms

1
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dy/dx sin x
\= cos x
2
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dy/dx cos x
\= -sin x
3
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dy/dx tan x
\= sec^2(x)
4
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dy/dx cot x
= -csc^2(x)
5
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dy/dx sec x
\= sec x tan x
6
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dy/dx csc x
\= csc x cot x
7
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∫ sin x dx
\= -cos x + C
8
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∫ cos x dx
\= sin x + C
9
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∫ tan x dx
\= ln |sec x| + C
10
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∫ cot x dx
\= ln |sin x| + C
11
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∫ sec x dx
\= ln |sec x + tan x| + C
12
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∫ csc x dx
\= ln |csc x + cot x| + C
13
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∫ 1/x dx
\= ln |x| + C
14
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cos(2x)
\= cos^2(x) - sin^2(x)
15
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cos^2(x) + sin^2(x)
\= 1
16
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sin (2x)
\= 2 sin x cos x
17
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cos^2(x)
= 1 - sin^2(x)
18
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cos^2(x)
= (1+cos2x) / 2
19
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sin^2(x)
= 1 - cos^2(x)
20
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sin^2(x)
= 1 - cos (2x) / 2
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∫ e^kx dx
\= e^kx / k + C
22
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∫ sec^2(x)
\= tan x + C
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∫ csc^2(x) dx
\= -cot x + C
24
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∫ csc x cot x dx
\= -csc x + C
25
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1 + cot^2(x)
\= csc^2(x)
26
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tan^2(x) + 1
= sec^2(x)
27
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What trig substitution does √(a^2 - x^2) belong with ? What is it's identity?
x \= a sin θ; 1 - sin^2(x) \= cos^2(x)
28
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What trig substitution does √(a^2 + x^2) belong with ? What is it's identity?
x \= a tan θ; 1 + tan^2(x) \= sec^2(x)
29
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What trig substitution does √(x^2 - a^2) belong with ? What is it's identity?
x \= a sec θ; sec^2(x) - 1 \= tan^2(x)
30
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How do you tell if a function is convergent?
The answer to the integral is a finite number.
31
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How can you tell if a function is divergent?
The answer to the integral is an infinite number (infinity).
32
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What is the integration by parts formula?
∫u dv \= uv - ∫v du