设xsiny+ysinx=y 求y' siny+xcosy*y'+y'*sinx+ycosx=0 为啥cosy后面还加个
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设xsiny+ysinx=y 求y' siny+xcosy*y'+y'*sinx+ycosx=0 为啥cosy后面还加个y' sinx前面加个y'?
![设xsiny+ysinx=y 求y' siny+xcosy*y'+y'*sinx+ycosx=0 为啥cosy后面还加个](/uploads/image/z/17667066-66-6.jpg?t=%E8%AE%BExsiny%2Bysinx%3Dy+%E6%B1%82y%27+siny%2Bxcosy%2Ay%27%2By%27%2Asinx%2Bycosx%3D0+%E4%B8%BA%E5%95%A5cosy%E5%90%8E%E9%9D%A2%E8%BF%98%E5%8A%A0%E4%B8%AA)
(ysin x)’=sin x+ycos x
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