यदि $u = \tan^{-1}(x + y)$ है,तो $x\frac{\partial u}{\partial x} + y\frac{\partial u}{\partial y} = $

  • A
    $\sin 2u$
  • B
    $\frac{1}{2}\sin 2u$
  • C
    $2\tan u$
  • D
    $\sec^2 u$

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