The value of ___tan [tan (-6)] is

The value of tan^(-1)tan(-6) is

The value of tan^(-1)tan(-6) is

If cos A,sin A,cot A are in G.P.then the value of tan ^(6)A-tan^(2)A is

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

The value of tan 7^(@) tan 23^(@) tan39^(@) tan 60^(@) tan 51^(@) tan 67^(@) tan 83^(@) 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^(@) .