differentiation

Question: If $u={{\tan }^{-1}}(x+y),$ then $x\frac{\partial u}{\partial x}+y\frac{\partial u}{\partial y}=$



1) $\sin 2u$
2) $\frac{1}{2}\sin 2u$
3) $2\tan u$
4) ${{\sec }^{2}}u$
Solution: Explanation: No Explanation
Partial differentiation

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