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Calculus Level 2

\[ \large \int_0^{\frac \pi 2} \frac1{1+\tan^3(x)} \, dx = \ ? \]

\[\frac\pi 5\] \[\frac\pi 6\] \[\frac\pi 3\] \[\frac\pi 4\]

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by Shashank Rustagi

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