Question

Which of the following equations are identities?

A. sin^2 x = 1 - cos^2 x

B. sin^2 x - cos^2 x = 1

C. tan^2 x = sec^2 x - 1

D. cot^2 x + csc^2 x = 1

***CHOOSE ALL THAT APPLY!!!!***

Answer 1

A,C,D?

Answer 2

Nope, D is no identity...