TrigonometryEasyGraphs of Sine and Cosine ShareGraphs of Sine and Cosine · Easy problemGive the equation of the midline of y=−12cos(13x−π2)+4y = -\dfrac{1}{2}\cos\left(\dfrac{1}{3}x - \dfrac{\pi}{2}\right) + 4y=−21cos(31x−2π)+4.Check Show answer Walk through it step by step Practice more like this Review this concept