If u-x2x2-y2-x2-y22 then x- u- x-y- u- y-

The correct option is B 0 u=x^2 ( x^2 y^2 ) ( x^2+y^2 )^2 u is a homogenous eq^n of degree n=0 x∂ y∂ x+y∂ y∂ y=0 ...

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Binomial Expression

If u=x2x2-y2/...

Question

$I f u = \frac{x^{2} (x^{2} - y^{2})}{(x^{2} + y^{2})^{2}}$

then $x \frac{\partial u}{\partial x} + y \frac{\partial u}{\partial y} = ?$

4 u

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