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If f(x,y) =e^(xy), then (del^(2)f)/(del ...

If `f(x,y) =e^(xy)`, then `(del^(2)f)/(del x del y)` is equal to

A

`xye^(xy)`

B

`(1+xy)e^(xy)`

C

`(1+y)e^(xy)`

D

`(1+x)e^(xy)`

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