siny2 - cosy2 = sinx2 + cosx2 = 1
2ycosy2·dy/dx +2ysiny2·dy/dx = 0
dy/dx = 0
siny2 - cosy2 = sinx2 + cosx2 = 1
2ycosy2·dy/dx +2ysiny2·dy/dx = 0
dy/dx = 0
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