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.

  • A
    $0$
  • B
    $-z$
  • C
    $z$
  • D
    $2x$

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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.

જો $u = \frac{x + y}{x - y}$ હોય,તો $\frac{\partial u}{\partial x} + \frac{\partial u}{\partial y} = $

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

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જો $z = \frac{y}{x} \left[ \sin \left( \frac{x}{y} \right) + \cos \left( 1 + \frac{y}{x} \right) \right]$ હોય,તો $x \frac{\partial z}{\partial x} = $

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.

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