Problemsin(π3)\sin\bigl(\tfrac{\pi}{3}\bigr)sin(3π)Step-by-step solutionπ3\frac{\pi}{3}3π 弧度 =60°= 60°=60°。在單位圓上 60°60°60° 處,y 座標為 32\frac{\sqrt{3}}{2}23。正弦等於 y 座標:sin(π3)=32\sin\bigl(\tfrac{\pi}{3}\bigr) = \frac{\sqrt{3}}{2}sin(3π)=23。Answersin(π3)=32\sin\bigl(\tfrac{\pi}{3}\bigr) = \tfrac{\sqrt{3}}{2}sin(3π)=23Want to solve a different problem? Open the sin-cos-tan solver →Related worked examples/solve/trigonometry/sin-30-degrees/solve/trigonometry/cos-60-degrees