Trig Identities Flashcards
(13 cards)
1
Q
What can cos2x be written as
A
cos^2x- sin^2x
1-2sin^2x
2cos^2x - 1
2
Q
What can cos4x be written as
A
cos^2 2x- sin^2 2x
1-2sin^2 2x
2cos^2 2x - 1
3
Q
What can sin2x be written as
A
2sinxcosx
4
Q
What trig equation = 1?
A
Sin^2 x + cos^2 x
5
Q
What’s the trig equation that = sec^2 x
A
1 + tan^2 x = sec^2 x
6
Q
What’s the trig equation that = cosec ^2 x
A
1 + cot^2 x = cosec^2 x
7
Q
What are the 3 reciprocal identities
A
- sinx => cosecx
- cosx => secx
- tanx => cotx
8
Q
Tanx in quotient form
A
Sinx/ cosx
9
Q
Cotx in quotient form
A
Cosx/ sinx
10
Q
What can 6sinxcosx be written as
A
3sin2x
11
Q
What’s tan2x
A
2tanx/ 1-tan^2x
12
Q
What is the rearranged double angle for integration for sin^2
A
1/2 - 1/2 cos2x
13
Q
What is the rearranged double angle for integration for cos^2
A
1/2 + 1/2 cos 2x
