જો $z = \sec^{-1}\left(\frac{x^4+y^4-8x^2y^2}{x^2+y^2}\right)$ હોય, તો $x \frac{\partial z}{\partial x} + y \frac{\partial z}{\partial y}$ ની કિંમત શોધો.

  • A
    $\cot z$
  • B
    $2 \cot z$
  • C
    $2 \tan z$
  • D
    $2 \sec z$

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જો ${z^2} = \frac{{x^{1/2} + y^{1/2}}}{{x^{1/3} + y^{1/3}}}$ હોય,તો $x\frac{{\partial z}}{{\partial x}} + y\frac{{\partial z}}{{\partial y}} = $

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 $u = \log ({x^2} + {y^2})$ હોય,તો $\frac{{\partial ^2}u}{\partial {x^2}} + \frac{{\partial ^2}u}{\partial {y^2}} = $

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

જો $u = \sin^{-1}\left(\frac{x}{y}\right) + \tan^{-1}\left(\frac{y}{x}\right)$ હોય, તો $x \frac{\partial u}{\partial x} + y \frac{\partial u}{\partial y}$ નું મૂલ્ય શું થાય?

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