Question

Prove the identity: tan^2O/ 1 + tan^20 = sin^20

I get 1=1, but others have got sin^2=sin^2
Who's right?? Because there is no answer for this question at the back of the book

Answer 1

Well if you're doing a proving of trigonometric expressions, you only modify or simplify one side of the equation. Usually it's left side of the equation.

So after you're done with proving, you should arrive at an answer
sin^2 (θ) = sin^2 (θ)