Question

**Check my answer?**
Which of the following is NOT an identity?

a. sin^2x+cos^2x=1
b. 1=sec^2x-tan^2x
c. tan^2x+1=sec^2x
d. cos^2x=1+sin^2x
e. csc^2x-1=cot^2x

I got d. is that right?

Answer 1

you are correct, nice work

Answer 2

it should be

cos^2 = 1 - sin^2