A better model might be to use sine and cosine functions with a periods of 1 day and 1 year. This we can do by changing the formula to.
更好的模型可能是使用以1天和1年为周期的正弦和余弦函数。
If there is a need to integrate some big power of cosine or sine then the formula will be given to you the way it is in the notes.
如果要计算cos, sin，的高次函数积分，则公式将会在注释中给出。
Methods of spherical trigonometry and direction cosine matrix were applied respectively to derive the bracket error, and the two methods had the same error formula and the same calculation results.
应用球面三角法和方向余弦矩阵法分别推导出双轴陀螺平台的支架误差公式，发现由这两种方法推导出来的公式计算结果是一致的。
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