यदि $u = x^2 \tan^{-1}(\frac{y}{x}) - y^2 \tan^{-1}(\frac{x}{y})$ है,तो $\frac{\partial^2 u}{\partial x \partial y} = $

  • A
    $\frac{x^2 + y^2}{x^2 - y^2}$
  • B
    $\frac{x^2 - y^2}{x^2 + y^2}$
  • C
    $-\frac{x^2 + y^2}{x^2 - y^2}$
  • D
    $-\frac{x^2 y^2}{x^2 + y^2}$

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यदि $z=\sec (y-ax)+\tan (y+ax)$ है, तो $\frac{\partial^2 z}{\partial x^2}-a^2 \frac{\partial^2 z}{\partial y^2}$ का मान ज्ञात कीजिए।

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यदि $z = \frac{y}{x} \left[ \sin \frac{x}{y} + \cos \left( 1 + \frac{y}{x} \right) \right]$ है, तो $x \frac{\partial z}{\partial x}$ किसके बराबर है?

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