$\tan 20^\circ \tan 40^\circ \tan 60^\circ \tan 80^\circ = $
$\tan 20^\circ \tan 40^\circ \tan 60^\circ \tan 80^\circ = $
- [IIT 1974]
- A
$1$
- B
$2$
- C
$3$
- D
$\sqrt 3 /2$
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- [IIT 1983]
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