समाकलन ज्ञात कीजिए: $\int \frac{x^3 \, dx}{1+x^8}$

  • A
    $4 \tan^{-1} x^3 + c$
  • B
    $\frac{1}{4} \tan^{-1} x^4 + c$
  • C
    $x + 4 \tan^{-1} x^4 + c$
  • D
    $x^2 + \frac{1}{4} \tan^{-1} x^4 + c$

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