Sin^2x-sin^4x=cos^2x-1 Prove this identity.

[From: ] [author: ] [Date: 12-02-02] [Hit: ]

i'm stuck on this problem.please help

It's not an identity. Let x = π/2, for example; the left side is 0 but the right side is -1.

keywords: cos,this,sin,Sin,identity,Prove,Sin^2x-sin^4x=cos^2x-1 Prove this identity.