$3 \tan^{-1} a$ બરાબર શું થાય?

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

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