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

यदि $u = \sin^{-1}\left(\frac{y}{x}\right)$ है,तो $\frac{\partial u}{\partial x}$ का मान क्या होगा?

यदि $u^2 = (x - a)^2 + (y - b)^2 + (z - c)^2$ है,तो $\sum \frac{\partial^2 u}{\partial x^2} = $

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