1. The problem statement, all variables and given/known data Prove the following trigonometric identity. The question is sin^4Ө =3/8-3/8cos(2Ө) 2. Relevant equations I think I'm supposed to use the power reducing formulas for trigonometric identities which are sin^2(u)= (1- cos(2u))/2 cos^2(u)=(1+cos(2u))/2 *Let u represent any integer/value* 3. The attempt at a solution To expand the equation I separated the equation into (1- cos^2Ө)(1- cos^2Ө) = 1- 2cos^2Ө + (cos^2Ө)^2. I reduced it because sin^2Ө = 1 – cos^2Ө and after this I'm confused on what the next steps are.