Question: z = x y ( i ) x d z d x + y d z d y = ( + ) ( ii )

z=xy
(i)xdzdx+ydzdy=(+)
(ii)
x2d2zdx2+2xyd2zdxdy+y2d2zdy2
=(+)(+-1)z
z = x y ( i ) x d z d x + y d z d y = ( + ) ( ii

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