Use the​ power-reducing formulas to rewrite the expression as an equivalent expression that does not contain powers of trigonometric functions greater than 1.

Question

9sin^4x =

(simplify your answer. use integers or fractions for any numbers in the expression.)

Answer 1

9sin^4(x)= 7.75 -2.25cos2x

sin^2(x) = (1+cos2x)/2

sin^4(x) = (1+cos^2(2x))/2