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

  • A
    $y \frac{\partial z}{\partial y}$
  • B
    $-y \frac{\partial z}{\partial y}$
  • C
    $2y \frac{\partial z}{\partial y}$
  • D
    $2y \frac{\partial z}{\partial x}$

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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 $u = \tan^{-1}(\frac{y}{x})$ है,तो यूलर प्रमेय के अनुसार $x \frac{\partial u}{\partial x} + y \frac{\partial u}{\partial y}$ का मान क्या होगा?

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

यदि $z = \frac{(x^4 + y^4)^{1/3}}{(x^3 + y^3)^{1/4}}$ है,तो $x\frac{\partial z}{\partial x} + y\frac{\partial z}{\partial y} = $

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

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