25 The value of tan6^° .tan42^° .tan66^° .tan78^° is

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

The value of tan6*tan42*tan66*tan78 is

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

tan6*tan42*tan66*tan78=1

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

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