यदि $x^k + y^k = a^k$ $(a, k > 0)$ और $\frac{dy}{dx} + (\frac{y}{x})^{\frac{1}{3}} = 0$ है,तो $k$ का मान ज्ञात कीजिए।

  • A
    $\frac{1}{3}$
  • B
    $\frac{2}{3}$
  • C
    $\frac{1}{4}$
  • D
    $\frac{2}{7}$

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