જો $u = x^2 + y^2$ અને $x = s + 3t, y = 2s - t$ હોય,તો $\frac{d^2u}{ds^2} = $

  • A
    $12$
  • B
    $32$
  • C
    $36$
  • D
    $10$

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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.

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

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 $u = \tan^{-1}\left(\frac{x^3 + y^3}{x - y}\right)$ હોય,તો $x\frac{\partial u}{\partial x} + y\frac{\partial u}{\partial y} = $

જો $u(x, y)=y \log x+x \log y$ હોય,તો $u_x u_y-u_x \log x-u_y \log y+\log x \log y$ ની કિંમત શું થાય?

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