在绘图中，您可以使用background来清除显示，然后计算发射方向的余弦值。
In draw, you use background to clear the display, and then calculate the direction cosines for the orientation of the cannon.
计算数值的双曲余弦值。！任意实数。！
Returns the hyperbolic cosine of a number! Is any real number !
通过构造灰色关联度判断矩阵，确定加权向量、灰色关联投影角余弦及相关模数、计算投影值等步骤建立评估模型。
Through establishing grey correlative judgment matrix, the weighting vectors, projected angle cosine and corresponding module were confirmed and projected values was calculated.
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