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।

  • A
    $0$
  • B
    $-z$
  • C
    $z$
  • D
    $2x$

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यदि $u = e^{-x^2 - y^2}$ है,तो

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

$z=\tan (y+a x)+\sqrt{y-a x} \Rightarrow z_{x x}-a^2 z_{y y}$ का मान ज्ञात कीजिए।

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?

यदि $u = \tan^{-1}\left(\frac{x^3 + y^3}{x - y}\right)$ है,तो $x\frac{\partial u}{\partial x} + y\frac{\partial u}{\partial y} = $

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