यदि $y = x \cdot 7^x$ है, तो $x = 1$ पर $\frac{dx}{dy}$ का मान है

  • A
    $7(\log 7 + 1)$
  • B
    $\log 7 + 1$
  • C
    $\frac{1}{7(\log 7 + 1)}$
  • D
    $\frac{1}{\log 7 + 1}$

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