मान लीजिए $5 f(x)+4 f\left(\frac{1}{x}\right)=\frac{1}{x}+3$,जहाँ $x > 0$ है। तो $18 \int \limits_1^2 f(x) \, dx$ का मान ज्ञात कीजिए:

  • A
    $10 \log _e 2-6$
  • B
    $10 \log _e 2+6$
  • C
    $5 \log _e 2+3$
  • D
    $5 \log _e 2-3$

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