TrigonometryEasySum, Difference, and Multiple-Angle Formulas ShareSum, Difference, and Multiple-Angle Formulas · Easy problemUse a power-reducing formula to rewrite cos2(3x)\cos^2(3x)cos2(3x).A1+cos6x3\dfrac{1+\cos 6x}{3}31+cos6xB1+cos6x2\dfrac{1+\cos 6x}{2}21+cos6xC21+cos6x\dfrac{2}{1+\cos 6x}1+cos6x2D2+cos6x2\dfrac{2+\cos 6x}{2}22+cos6xCheck Show answer Walk through it step by step Practice more like this Review this concept