TrigonometryHardGraphs of Sine and Cosine ShareGraphs of Sine and Cosine · Hard problemHow many solutions does cos(4x)=−12\cos{\left(4 x \right)} = - \frac{1}{2}cos(4x)=−21 have on [0,2π][0, 2\pi][0,2π]?Check Show answer Walk through it step by step Practice more like this Review this concept