The value of $\int_{ - a}^a {\frac{1}{{x + {x^3}}}} dx$ is

  • A
    $0$
  • B
    $\int_0^a {\frac{1}{{1 + {x^6}}}} dx$
  • C
    $2\int_0^a {\frac{1}{{1 + {x^3}}}} dx$
  • D
    $\int_0^a {\frac{1}{{1 + {{(a - x)}^3}}}} dx$

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