Question

is sin^2x-1 an identity? If so, does it equal -1?

Answer 1

Draw out your expression again please.

Answer 2

cos^2(x) + sin^2(x)=1

Answer 3

cos^2(x) = 1 - sin^2(x)

Answer 4

or -cos^(x) = sin^2(x)-1

Answer 5

-(cos^2(x) + sin^2(x) ) = -1