TrigonometryChallengeTrigonometric Equations ShareTrigonometric Equations · Challenge problemHow many real numbers xxx with 0≤x≤400 \le x \le 400≤x≤40 satisfy cosπx4=cosπx5\cos\dfrac{\pi x}{4} = \cos\dfrac{\pi x}{5}cos4πx=cos5πx?Check Show answer Walk through it step by step Practice more like this Review this concept