TrigonometryEasySum, Difference, and Multiple-Angle Formulas ShareSum, Difference, and Multiple-Angle Formulas · Easy problemUse a half-angle formula to find sinπ8\sin\dfrac{\pi}{8}sin8π (note π8=12⋅π4\tfrac{\pi}{8}=\tfrac{1}{2}\cdot\tfrac{\pi}{4}8π=21⋅4π, Quadrant I).A22−2\dfrac{2}{\sqrt{2-\sqrt2}}2−22B4−22\dfrac{\sqrt{4-\sqrt2}}{2}24−2C2−22\dfrac{\sqrt{2-\sqrt2}}{2}22−2D2−23\dfrac{\sqrt{2-\sqrt2}}{3}32−2Check Show answer Walk through it step by step Practice more like this Review this concept