यदि $u = \sin^{-1} \sqrt{\frac{x^2 + y^2}{x + y}}$ है,तो $x u_x + y u_y$ का मान ज्ञात कीजिए।

  • A
    $0$
  • B
    $1$
  • C
    $\frac{1}{2} \tan u$
  • D
    $\frac{1}{2} \sin u$

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यदि $z = \frac{y}{x} \left[ \sin \frac{x}{y} + \cos \left( 1 + \frac{y}{x} \right) \right]$ है, तो $x \frac{\partial z}{\partial x}$ किसके बराबर है?

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

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

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

यदि $u=\sin ^{-1}\left(\frac{x^4+y^4}{x+y}\right)$ है,तो $x \frac{\partial u}{\partial x}+y \frac{\partial u}{\partial y}$ का मान ज्ञात कीजिए।

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