$\int x^5 e^{-2 x} d x=$

  • A
    $e^{-2 x}\left[\frac{x^5}{2}-\frac{5 x^4}{2^2}+\frac{20 x^3}{2^3}-\frac{60 x^2}{2^4}+\frac{120 x}{2^5}-\frac{120}{2^6}\right]+c$
  • B
    $-e^{-2 x}\left[\frac{x^5}{2}+\frac{5 x^4}{4}+\frac{5 x^3}{2}+\frac{15 x^2}{4}+\frac{15 x}{4}+\frac{15}{8}\right]+c$
  • C
    $-e^{-2 x}\left[\frac{x^5}{2}+\frac{5 x^4}{4}+\frac{5 x^3}{2}+\frac{15 x^2}{4}+\frac{15 x}{4}+\frac{15}{8}\right]+c$
  • D
    $e^{-2 x}\left[\frac{x^5}{2}+\frac{5 x^4}{4}+\frac{5 x^3}{2}+\frac{15 x^2}{4}+\frac{15 x}{4}+\frac{15}{8}\right]+c$

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

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