Trig Flashcards
1
Q
What is the double angle identity for sin
A
Sin2A = 2sinAcosA
2
Q
What is a double angle identity for cos
A
Cos2A = 2cos squared A - 1
= 1 - 2sin squared A
= cos squared A - sin squared A
3
Q
What is the double angle identity for tan
A
Tan2A = 2tanA divided by 1 - tan squared A
4
Q
What trig function involves 1/cosx
A
Sec x = 1/cos x
5
Q
What trig function involves 1/sinx
A
Cosec x = 1/sin x
6
Q
What trig function involves 1/tan x
A
Cot x= 1/tan x
7
Q
What is the identity for sec squared x
A
Sec squared x = tan squared x + 1
8
Q
What is the identity for cosec squared x
A
Cosec squared x = 1 + cot squared x
