The length of the largest continuous interval in which the function \( f(x)=4 x-\tan 2 x \) is m...

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The length of the largest continuous interval in which the function \( f(x)=4 x-\tan 2 x \) is monotonic is
(A) \( \pi / 2 \)
(B) \( \pi / 4 \)
(C) \( \pi / 8 \)
(D) \( \pi / 16 \)
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