यदि $z = \sec^{-1}\left(\frac{x^4+y^4-8x^2y^2}{x^2+y^2}\right)$ है, तो $x \frac{\partial z}{\partial x} + y \frac{\partial z}{\partial y}$ का मान ज्ञात कीजिए।

  • A
    $\cot z$
  • B
    $2 \cot z$
  • C
    $2 \tan z$
  • D
    $2 \sec z$

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