用3阶泰勒公式求sin18°的近似值并估计误差
问题描述：
用3阶泰勒公式求sin18°的近似值并估计误差
答
sinx=x^5/120 - x^3/6 + x
x=18°=pi/10;
sin18°的近似值=x^5/120 - x^3/6 + x=0.309016994374947
sin18°的真值=0.309016994374947