TrigonometryEasySum, Difference, and Multiple-Angle Formulas ShareSum, Difference, and Multiple-Angle Formulas · Easy problemSimplify cos2x−sin2x\cos^2 x-\sin^2 xcos2x−sin2x to a single function.Acos4x\cos 4xcos4xBcos2x\cos 2xcos2xC−cos2x-\cos 2x−cos2xDcos3x\cos 3xcos3xCheck Show answer Walk through it step by step Practice more like this Review this concept