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在28335电机套件的程序中有个图中有sin\cos转变的功能,就在斜坡函数的后面,灰色的。就我了解好像是程序只有sin函数没有cos函数,然后为了计算cos,将角度加上90度变成sin(§+90)换算成cos.但是我不明白的地方是park变换里面既有sin也有cos,直接将角度加上90度的话,那么原本的sin函数还怎么算呢