यदि $u \equiv u(x, y) = \sin(y + ax) - (y + ax)^2$ है,तो यह क्या दर्शाता है?

  • 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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वास्तविक संख्याओं $x$ और $y$ के लिए $2x^{2} + y^{2} + 2xy + 2x - 3y + 8$ का न्यूनतम मान क्या है?

यदि $u=f(r)$, जहाँ $r^2=x^2+y^2$ है, तो $\left(\frac{\partial^2 u}{\partial x^2}+\frac{\partial^2 u}{\partial y^2}\right)$ का मान क्या होगा?

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?

$z=\tan (y+a x)+\sqrt{y-a x} \Rightarrow z_{x x}-a^2 z_{y y}$ का मान ज्ञात कीजिए।

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

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