Question

I have a question about Trig/Pre Calc.
The question is which of the following is NOT an identity.
A) 1+cos^2x/sin^2x=1
B) (cos x+ sinx)^2 = 1+2cosx sinx
C) (tanx +cotx)^2= csc^2x+sec^2x
D) tan^2x = sec^2x -cos^2x

Thank you :)

Answer 1

Never mind, I found the answer!