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

  • A
    $u_{xx} = a^2 \cdot u_{yy}$
  • B
    $u_{yy} = a^2 u_{xx}$
  • C
    $u_{xx} = -a^2 \cdot u_{yy}$
  • D
    $u_{yy} = -a^2 u_{xx}$

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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 $u = \sin^{-1}\left(\frac{y}{x}\right)$ હોય,તો $\frac{\partial u}{\partial x}$ ની કિંમત શું થાય?

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 $z=\log (\tan x+\tan y)$ હોય,તો $(\sin 2 x) \frac{\partial z}{\partial x}+(\sin 2 y) \frac{\partial z}{\partial y}$ 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?

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