Question

Multiply, and then use the fundamental identities to simplify the expression below and determine which of the following is not equivalent.

A. 1 - 2cos^2x
B. sin^2 x - cos^2 x
C. 2 sin^2 x - sec^2 x - tan^2 x

C?

Answer 1

@peachpi

Answer 2

what's the original expression

Answer 3

It's (sin x + cos x)(sin x - cos x)

Answer 4

yes C

Answer 5

Thanks!

Answer 6

you're welcome