Use the power-reducing formulas to rewrite the expression in terms of first powers of the cosines of multiple angles. 3 cos4(x)

Answer 1

3 cos⁴ x

3 cos² x cos² x

3 (cos² x)²

3((1 + cos 2x) / 2)²

3((1 + 2 cos 2x + cos² 2x) / 4)

3(1 + 2 cos 2x + ((1 + cos 4x) / 2)) / 4