(13)/(3+2tan^(2)x)

tan x+tan(x+(pi)/(3))+tan(x+2(pi)/(3))=3 prove that (3tan x-tan^(3)x)/(1-3tan^(2)x)=1

If tan x+tan(x+(pi)/(3))+tan(x+(2 pi)/(3))=3 then prove that (3tan x-tan^(3)x)/(1-3tan^(2)x)=1

Show that tan 3 x=(3 tan x-tan ^(3) x)/(1-3 tan ^(2) x)

Integrate the following w.r.t.x. (sec^(2)x)/(2tan^(2)x+7tanx+13)

(d) / (dx) [((tan ^ (2) 2x-tan ^ (2) x) / (1-tan ^ (2) 2x tan ^ (2) x)) cot3x] =

int((3tan^(2)x+2)sec^(2)x)/(tan^(3)x+2tan x+5)dx

lim_(x rarr tan^(-1)) (tan^(2)x - 2tanx -3)/(tan^(2)x - 4tan x +3 ) =

Prove that tan 3x= (3tan x-tan^3 x)/(1-3tan^2 x)

Let |{:(tan^(-1)x, tan^(-1)2x, tan^(-1)3x), (tan^(-1)3x, tan^(-1)x, tan^(-1)2x), (tan^(-1)2x, tan^(-1)3x, tan^(-1)x):}|=0 , then the number of values of x satisfying the equation is