Jika tan x=½√3 kemudian tan (x-30)

Tan x = 1/2 √3
tan 30° = 1/3 √3

tan (x – 30)
= (tan x – tan 30)/(1 – tan x tan 30)
= (1/2 √3 – 1/3 √3) / (1 – 1/2 √3 . 1/2 √3)
= (1/6 √3) / (1 – 3/4)
= 1/6 √3 . 4/1
= 2/3 √3