यदि $u = u(x, y) = \sin(y + ax) - (y + ax)^2$ है,तो निम्नलिखित में से कौन सा सत्य है?

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

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Similar Questions

यदि $u = x y^2 \tan^{-1}\left(\frac{y}{x}\right)$ है,तो $x \frac{\partial u}{\partial x} + y \frac{\partial u}{\partial y}$ का मान ज्ञात कीजिए।

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

यदि $z=\log (\tan x+\tan y)$ है,तो $(\sin 2 x) \frac{\partial z}{\partial x}+(\sin 2 y) \frac{\partial z}{\partial y}$ का मान ज्ञात कीजिए।

यदि $f(x, y) = \frac{\cos(x - 4y)}{\cos(x + 4y)}$ है,तो $\left. \frac{\partial f}{\partial x} \right|_{y = \frac{x}{2}}$ का मान क्या होगा?

यदि $u=e^{x^2-y^2}$ है,तो

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