यदि $u = \sin^{-1} \sqrt{\frac{x^2 + y^2}{x + y}}$ है,तो $x u_x + y u_y$ का मान ज्ञात कीजिए।

  • A
    $0$
  • B
    $1$
  • C
    $\frac{1}{2} \tan u$
  • D
    $\frac{1}{2} \sin u$

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यदि $u = e^{-x^2 - y^2}$ है,तो

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

यदि $u(x, y)=y \log x+x \log y$ है,तो $u_x u_y-u_x \log x-u_y \log y+\log x \log y$ का मान क्या होगा?

यदि $u = (x^2 + y^2 + z^2)^{3/2}$ है,तो $\left( \frac{\partial u}{\partial x} \right)^2 + \left( \frac{\partial u}{\partial y} \right)^2 + \left( \frac{\partial u}{\partial z} \right)^2 = $

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

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