જો $\int \frac{x^2(x \sec^2 x+\tan x)}{(x \tan x+1)^2} dx = A \log(|x \sin x+\cos x|) + B \frac{f(x)}{(x \tan x+1)} + C$ હોય,તો $f(A+B) =$

  • A
    $1$
  • B
    $0$
  • C
    $-1$
  • D
    $2$

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