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The value of tan 6^(@) tan 42^(@) tan 66...

The value of `tan 6^(@) tan 42^(@) tan 66^(@) tan 78^(@)` is

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Prove that tan A. (tan 60^(@) +A). Tan (60^(@)-A)=tan 3A and hence find the value of tan 6^(@) tan 42^(@) tan 66^(@) tan 78^(@) .

tan 6 ^(@) tan 42 ^(@) tan 66 ^(@) tan 78^(@) =1

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