要准确快速地计算正弦函数和其他函数，需要非常仔细的算法，专门用于避免无意地将小的误差变成大的错误。
Proper calculations of sine and other functions that are both accurate and fast require very careful algorithms designed to avoid accidentally turning small errors into large ones.
实践证明该算法具有计算速度快、预测精度高、预测误差变化小等优点。
Practical examples prove its fast calculation speed , high forecast accuracy and small error variety.
利用本算法，图像面积和周长的计算误差最大不超过2 % 。
Using this algorithm, the computation error of image area and girth is less than 2 percents.
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