यदि $x^{m} y^{n}=(x+y)^{m+n}$ है,तो $\frac{dy}{dx}$ का मान ज्ञात कीजिए।

  • A
    $\frac{x+y}{xy}$
  • B
    $xy$
  • C
    $0$
  • D
    $\frac{y}{x}$

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