y=cos(xy)-x 求微分
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y=cos(xy)-x 求微分
![y=cos(xy)-x 求微分](/uploads/image/z/18366299-35-9.jpg?t=y%3Dcos%EF%BC%88xy%EF%BC%89-x+%E6%B1%82%E5%BE%AE%E5%88%86)
y'=-sin(xy)*(xy)'-1
y'=-sin(xy)(y+xy')-1
y'=-ysin(xy)-xy'sin(xy)-1
把y'弄到一边去
y'=(-ysin(xy)-1)/(1+xsin(xy))
dy=(-ysin(xy)-1)/(1+xsin(xy))dx
y'=-sin(xy)(y+xy')-1
y'=-ysin(xy)-xy'sin(xy)-1
把y'弄到一边去
y'=(-ysin(xy)-1)/(1+xsin(xy))
dy=(-ysin(xy)-1)/(1+xsin(xy))dx
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