$\int \frac{1}{x^2} (2x + 1)^3 dx = $

  • A
    $4x^2 + 12x + 6\log|x| - \frac{1}{x} + c$
  • B
    $4x^2 + 12x - 6\log|x| - \frac{2}{x} + c$
  • C
    $2x^2 + 8x + 3\log|x| - \frac{2}{x} + c$
  • D
    $8x^2 + 6x + 6\log|x| + \frac{2}{x} + c$

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मान लीजिए $f(x) = \tan^{-1}\left(\frac{1+\cos x}{\sin x}\right)$ और $g(x) = \tan^{-1}\left(\frac{\sin x}{1-\cos x}\right)$ है। तो,$\int (f(x) + g(x)) \, dx$ का मान ज्ञात कीजिए।

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