\( \int_{-\pi / 3}^{-\pi / 6} \frac{d x}{1+\tan ^{4} x}= \)....

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\( \int_{-\pi / 3}^{-\pi / 6} \frac{d x}{1+\tan ^{4} x}= \)
\( \mathrm{P} \)
(1) \( \frac{\pi}{4} \)
(2) \( \frac{\pi}{6} \)
(3) \( \frac{\pi}{12} \)
(4) \( \frac{\pi}{2} \)



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