dz=d(sinxy)+d(cos(x+y))
=cosxyd(xy)-sin(x+y)d(x+y)
=ycosxydx+xcosxydy-sin(x+y)dx-sin(x+y)dy
=[ycosxy-sin(x+y)]dx+[xcosxy-sin(x+y)]dy
设z=sinxy+cos(x+y)则dz=
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