[安乐椅#18] 三角函数技巧
特殊角三角函数值
\(\sin{\dfrac{\pi}{12}}=\dfrac{\sqrt{6}-\sqrt{2}}{4}\)
\(\sin{\dfrac{\pi}{8}}=\dfrac{\sqrt{2-\sqrt{2}}}{2}\)
\(\sin{\dfrac{\pi}{6}}=\dfrac{1}{2}\)
\(\sin{\dfrac{\pi}{4}}=\dfrac{\sqrt{2}}{2}\)
\(\sin{\dfrac{\pi}{3}}=\dfrac{\sqrt{3}}{2}\)
\(\sin{\dfrac{3\pi}{8}}=\dfrac{\sqrt{2+\sqrt{2}}}{2}\)