Question

Prove the identity 1-(cosx-sinx)^2=sin2x

Answer 1

your attempt?

Answer 2

don't you have any idea??
Hint: open the bracket,

Answer 3

(cosx-sinx)(cosx-sinx) ...?

I'm not familiar with math that doesn't involve numbers. It took me so long to reply because I was on a cell phone and it was nearly impossible to type a reply.

Answer 4

yes, continue, please

Answer 5

I'm honestly not sure how to continue. I guess 1-(cosx)^2-(sinx)^2=sin2x. Do I divide two?