$x > 0$ के लिए,मान लीजिए $f(x) = \int_{1}^{x} \frac{\log t}{1+t} dt$. तो $f(x) + f\left(\frac{1}{x}\right)$ का मान ज्ञात कीजिए:

  • A
    $\frac{1}{4}(\log x)^2$
  • B
    $\log x$
  • C
    $\frac{1}{2}(\log x)^2$
  • D
    $\frac{1}{4}\log(x^2)$

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$n \in N$ के लिए,मान लीजिए $P_n = \int_1^e (\ln x)^n dx$ है। तो $(P_{10} - 90P_8)$ का मान ज्ञात कीजिए।

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