$\int \frac{e^x(x + 1)}{\cos^2(x e^x)} dx = $

  • A
    $\tan(x e^x) + c$
  • B
    $\sec(x e^x) \tan(x e^x) + c$
  • C
    $-\tan(x e^x) + c$
  • D
    इनमें से कोई नहीं

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यदि $f_n(x) = \log \log \log \ldots \log x$ (जहाँ $\log$ $n$ बार दोहराया गया है), तो $\int (x f_1(x) f_2(x) \ldots f_n(x))^{-1} dx$ का मान ज्ञात कीजिए।

$\int \frac{\csc x}{\log \tan \frac{x}{2}} \, dx = $

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