此方程可用泰勒展开式导出。
采用正弦和余弦的泰勒展开式构造的迭代公式，计算一个绘图点只需9次加法。
Adopt the iterative formula that forms Taylor's expansion of sine and cosine, and compute a graphic points are only calculated by 9 times addition.
构造的思路是先将其转化为相应的泰勒展开式，然后使用健忘多项式计算协议获得结果。
The oblivious polynomial evaluation protocol will be used many times in our privacy preserving naive bayesian classifier, so its efficiency is important to the solution.
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