首先采用cordic坐标旋转数字计算法推导求解三角函数的有效算法，然后利用小角度时的三角函数倍角公式推导有效的三角函数Cos,Sin 求解方法。-First use of cordic CORDIC trigonometric calculations derived an effective algorithm to solve, and then use the small angle formula of trigonometric double angle trigonometric f