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 $u = \sin^{-1}\left(\frac{x}{y}\right) + \tan^{-1}\left(\frac{y}{x}\right)$ है,तो $x \frac{\partial u}{\partial x} + y \frac{\partial u}{\partial y}$ का मान क्या है?

यदि $u \equiv u(x, y) = \sin(y + ax) - (y + ax)^2$ है,तो यह क्या दर्शाता है?

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 $f(x, y) = \frac{\cos(x - 4y)}{\cos(x + 4y)}$ है,तो $\left. \frac{\partial f}{\partial x} \right|_{y = \frac{x}{4}}$ का मान ज्ञात कीजिए:

$\begin{aligned} & f(x, y)=2(x-y)^2-x^4-y^4 \\ & \left|\left(f_{x x} f_{y y}-f_{x y}^2\right)\right|_{(0,0)} \end{aligned}$

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