જો $\int \frac{x^2(x \sec^2 x+\tan x)}{(x \tan x+1)^2} dx = \frac{-x^2}{x \tan x+1} + f(x) + c$ હોય,તો $f(x) =$

  • A
    $2 \log |x \sin x + \cos x| + c$
  • B
    $2 \log |x \cos x + \sin x| + c$
  • C
    $\log |x \sin x + \cos x| + c$
  • D
    $\log |x \cos x + \sin x| + c$

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