$\int \frac{5(x^6 + 1)}{x^2 + 1} dx = $

  • A
    $5(x^7 + x)\tan^{-1}x + c$
  • B
    $x^5 - \frac{5}{3}x^3 + 5x + c$
  • C
    $3x^4 - 5x^2 + 15x + c$
  • D
    $5\tan^{-1}(x^2 + 1) + \log(x^2 + 1) + c$

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