यदि $z = \tan^{-1}\left(\frac{x}{y}\right)$ है,तो $z_x : z_y = $

  • A
    $y:x$
  • B
    $x:y$
  • C
    $-y:x$
  • D
    $-x:y$

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

यदि $f(x, y) = \frac{\cos(x - 4y)}{\cos(x + 4y)}$ है,तो $\left. \frac{\partial f}{\partial x} \right|_{y = \frac{x}{4}}$ का मान ज्ञात कीजिए:

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

यदि $u = x^2 + y^2$ और $x = s + 3t, y = 2s - t$ है,तो $\frac{d^2u}{ds^2} = $

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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?

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