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

  • A
    $\sin u$
  • B
    $\tan u$
  • C
    $\cos u$
  • D
    $\cot u$

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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 = $

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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।

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} = $

यदि $u=\log \left(x^3+y^3+z^3-3 x y z\right)$ है,तो $(x+y+z)(u_x+u_y+u_z)$ का मान ज्ञात कीजिए।

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