z=arctan(x-y),求dz
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z=arctan(x-y),求dz
![z=arctan(x-y),求dz](/uploads/image/z/19933346-2-6.jpg?t=z%3Darctan%EF%BC%88x-y%EF%BC%89%2C%E6%B1%82dz)
dz=arctan(x+y)/(x-y) dx+arctan(x+y)/(x-y) dy =((x-y)/(1+(x+y)^2)+(x-1)arctan(x+y))dx/(x-y)^2+((x-y)/(1+(x+y)^2)-(1-y)arctan(x+y))dy/(x+y)^2
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