TrigonometryChallengeTrigonometric Equations ShareTrigonometric Equations · Challenge problemSolve cos5x+cosx=cos3x\cos 5x+\cos x=\cos 3xcos5x+cosx=cos3x on [0,2π)[0,2\pi)[0,2π). Some roots are double roots.Check Show answer Walk through it step by step Practice more like this Review this concept