Fam-tan 2-tan3=then which of the folowing can hold good?

If tan x+tan2x+tan3x=0 then which of the following can hold good?

If tan x + tan 2x + tan 3x = 0 then which of the following can hold good ?

If (2tan^(2)theta_(1)tan^(2)theta_(2)tan^(2)theta_(3)+tan^(2)theta_(1)tan^(2)theta_(2)+tan^(2)theta_(2)tan^(2)theta_(3)+tan^(2)theta_(3)tan^(2)theta_(1)=1 then which of the following relations hold good ?

If sin alpha=2sin beta and tan((alpha-beta)/(2))=(1)/(9) then which of the following holds good?

For the function f(x)=e^(e^(x))-tan^(-1)x-3=0 which of the following holds good?