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If u (x,y) =x ^(2) + 2xy-y ^(2) then (de...

If `u (x,y) =x ^(2) + 2xy-y ^(2)` then `(del u)/(del x) + (delu)/(del y) ` is:

A

`4x + 2y`

B

`4x`

C

`(1)/(4x)`

D

`0`

Text Solution

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The correct Answer is:
B
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