Find the value of tan6^(@)tan42^(@)tan66^(@)tan78^(@)

The value of tan6^(@)tan42^(@)tan66^(@)tan78^(@) is

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^(@) .

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

The value of tan6^(@)tan42^(@)tan66^(@)tan78^(@) is (a) 1 (b) (1)/(2)(c)(1)/(4)(d)(1)/(8)

The value of tan6^@ tan42^@ tan66^@ tan78^@ is

Find the value of tan4^(@).tan43^(@).tan47^(@).tan86^(@) .

Find the value of tan56^(@)-tan11^(@)-tan56^(@).tan11^(@) .

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