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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જો $u = \sin^{-1} \sqrt{\frac{x^2 + y^2}{x + y}}$ હોય,તો $x u_x + y u_y$ ની કિંમત શોધો.

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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 $z=\sec (y-ax)+\tan (y+ax)$ હોય, તો $\frac{\partial^2 z}{\partial x^2}-a^2 \frac{\partial^2 z}{\partial y^2}$ ની કિંમત શોધો.

જો $u = u(x, y) = \sin(y + ax) - (y + ax)^2$ હોય, તો નીચેનામાંથી શું સાચું છે?

જો $u=\log \left(x^3+y^3+z^3-3 x y z\right)$ હોય,તો $(x+y+z)(u_x+u_y+u_z)$ ની કિંમત શોધો.

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