Prove that : \( \tan 20^{\circ} \tan 40^{\circ} \tan 60^{\circ} \tan 80^{\circ}=3 \)

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Prove that :
\( \tan 20^{\circ} \tan 40^{\circ} \tan 60^{\circ} \tan 80^{\circ}=3 \)
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