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

  • A
    $\frac{1}{x - y}$
  • B
    $\frac{2}{x - y}$
  • C
    $\frac{1}{(x - y)^2}$
  • D
    $\frac{2}{(x - y)^2}$

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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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$\begin{aligned} & f(x, y)=2(x-y)^2-x^4-y^4 \\ & \left|\left(f_{x x} f_{y y}-f_{x y}^2\right)\right|_{(0,0)} \end{aligned}$

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

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

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