यदि $u = \log ({x^2} + {y^2})$ है,तो $\frac{{\partial ^2}u}{\partial {x^2}} + \frac{{\partial ^2}u}{\partial {y^2}} = $

  • A
    $\frac{1}{{{x^2} + {y^2}}}$
  • B
    $0$
  • C
    $\frac{{{x^2} - {y^2}}}{{{{({x^2} + {y^2})}^2}}}$
  • D
    $\frac{{{y^2} - {x^2}}}{{{{({x^2} + {y^2})}^2}}}$

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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} = $

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यदि $u = \tan^{-1}(\frac{y}{x})$ है,तो यूलर प्रमेय के अनुसार $x \frac{\partial u}{\partial x} + y \frac{\partial u}{\partial y}$ का मान क्या होगा?

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:

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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