यदि $z = \sec^{-1}\left(\frac{x^4+y^4-8x^2y^2}{x^2+y^2}\right)$ है, तो $x \frac{\partial z}{\partial x} + y \frac{\partial z}{\partial y}$ का मान ज्ञात कीजिए।

  • A
    $\cot z$
  • B
    $2 \cot z$
  • C
    $2 \tan z$
  • D
    $2 \sec z$

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$z=\tan (y+a x)+\sqrt{y-a x} \Rightarrow z_{x x}-a^2 z_{y y}$ 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 $u = \sin^{-1} \sqrt{\frac{x^2 + y^2}{x + y}}$ है,तो $x u_x + y u_y$ का मान ज्ञात कीजिए।

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यदि $u = e^{-x^2 - y^2}$ है,तो

यदि $u=\sin ^{-1}\left(\frac{x^4+y^4}{x+y}\right)$ है,तो $x \frac{\partial u}{\partial x}+y \frac{\partial u}{\partial y}$ का मान ज्ञात कीजिए।

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