यदि $u = \tan^{-1}(\frac{y}{x})$ है,तो यूलर प्रमेय के अनुसार $x \frac{\partial u}{\partial x} + y \frac{\partial u}{\partial y}$ का मान क्या होगा?

  • A
    $0$
  • B
    $\sin 2u$
  • C
    $\tan u$
  • D
    $\cos 2u$

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यदि $u = \sin^{-1}\left(\frac{x}{y}\right) + \tan^{-1}\left(\frac{y}{x}\right)$ है, तो $x \frac{\partial u}{\partial x} + y \frac{\partial u}{\partial y}$ का मान क्या है?

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