If f = (x+y)/(sqrt(x-y)) then x (delf)/(...

If `f = (x+y)/(sqrt(x-y))` then `x (delf)/(delx) +y (delf)/(dely) ` is :

A

`-2f`

B

`f/2`

C

`2f`

D

`(-f)/(2)`

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