Question

Which of the following are identities? Check all that apply.
A. sin^2 x-cos^2 x =1
B. tan^2 x = 1 + sec^2 x
C. sin^2 x = 1 - cos^2 x
D. cot^2 x = csc^2 x - 1

Thanks!

Answer 1

c

Answer 2

I believe D is also an answer.

Answer 3

yah

Answer 4

Alright thanks.