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这题的向量关系是怎么推导的？

Posted by houzhe at 2021-04-05 13:54:02 on Problem 2991

按照挑战书中所说：

vx[v] = vx[chl] + (c * vx[chr] - s * vy[chr]);
vy[v] = vy[chl] + (s * vx[chr] + c * vy[chr]);

这个关系是依据什么推导出来的？

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