જો $u = \log ({x^2} + {y^2})$ હોય,તો $\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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Similar Questions

$z=\tan (y+a x)+\sqrt{y-a x} \Rightarrow z_{x x}-a^2 z_{y y}$ ની કિંમત શોધો.

જો $u=\sin ^{-1}\left(\frac{x^4+y^4}{x+y}\right)$ હોય,તો $x \frac{\partial u}{\partial x}+y \frac{\partial u}{\partial y}$ ની કિંમત શોધો.

જો $u = \tan^{-1}(\frac{y}{x})$ હોય,તો આઈલરના પ્રમેય મુજબ $x \frac{\partial u}{\partial x} + y \frac{\partial u}{\partial y}$ ની કિંમત શું થાય?

જો $u = x y^2 \tan^{-1}\left(\frac{y}{x}\right)$ હોય,તો $x \frac{\partial u}{\partial x} + y \frac{\partial u}{\partial y}$ ની કિંમત શોધો.

જો $z = \frac{(x^4 + y^4)^{1/3}}{(x^3 + y^3)^{1/4}}$ હોય,તો $x\frac{\partial z}{\partial x} + y\frac{\partial z}{\partial y} = $

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