47. Prove: tan 6 . tan 42 . tan 66 . tan 78 = 1

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t a n 6^{\circ} t a n 42^{\circ} t a n 66^{\circ} t a n 78^{\circ} = 1

tan6*tan42*tan66*tan78=1

tan 6^{o} tan 42^{o} tan 66^{o} tan 78^{o} =

The value of tan6*tan42*tan66*tan78 is

tan 6^{\circ} tan 42^{\circ} tan 66^{\circ} tan 78^{\circ}

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