\begin{array}{l}{\text { If } u=\sin ^{-1} \frac{x^{2}+y^{2}}{x+y}, x+ – InterviewSolution

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1.	\begin{array}{l}{\text { If } u=\sin ^{-1} \frac{x^{2}+y^{2}}{x+y}, x+y \neq 0, \text { then prove that }} \\ {x \frac{\partial u}{\partial x}+y \frac{\partial u}{\partial y}=\tan u}\end{array}
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