If $u=\tan ^{-1}\left(\frac{x^{3}+y^{3}}{x-y}\right),$ prove that $x \ – InterviewSolution

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1.	If $u=\tan ^{-1}\left(\frac{x^{3}+y^{3}}{x-y}\right),$ prove that $x \frac{\partial u}{\partial x}+\frac{\partial u}{\partial y}=\sin 2 u$
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