If \( \alpha=\frac{\pi}{14} \), then the value of \( (\tan \alpha \tan 2 \alpha+\tan 2 \alpha \t...
If \( \alpha=\frac{\pi}{14} \), then the value of \( (\tan \alpha \tan 2 \alpha+\tan 2 \alpha \tan 4 \alpha \) \( +\tan 4 \alpha \tan \alpha) \) is
(1) 1
(2) \( 1 / 2 \)
(3) 2
(4) \( 1 / 3 \)
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