Sin^2x=1/2(1-Cos2x) - Math Central
Hi Chris, When I see this question I realize that I need to express cos(2x) in terms of sin(x) and cos(x). I know that cos(2x) = cos 2 (x) - sin 2 (x) But the left side has only sin 2 (x) and no cosines so in the expression for cos(2x) above I can use the...