球面三角公式繁杂，学生在实际运用时感到困难。
Students may be confronted with difficulties in the application of complicated formulae of Spherical Trigonometry.
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。
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.
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