यदि ${2^x} + {2^y} = {2^{x + y}}$ है,तो $\frac{dy}{dx} = $

  • A
    ${2^{x - y}} \frac{2^y - 1}{2^x - 1}$
  • B
    ${2^{x - y}} \frac{2^y - 1}{1 - 2^x}$
  • C
    $\frac{2^x + 2^y}{2^x - 2^y}$
  • D
    इनमें से कोई नहीं

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