$x > 7$ के लिए फलन $f(x) = \log_5(\log_7 x)$ का अवकलज ज्ञात कीजिए।

  • A
    $\frac{1}{x(\ln 5)(\ln 7)(\log_7 x)}$
  • B
    $\frac{1}{x(\ln 5)(\ln 7)}$
  • C
    $\frac{1}{x(\ln x)}$
  • D
    इनमें से कोई नहीं

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