Jika tan x = 1/2 akar 3 maka tan ( x - 30° )

Materi : Trigonometri

Pembahasan :
Tan (x - 30°)
= (Tan x - Tan 30°)/(1 + Tan x . Tan 30°)
= (1/2 √3 - 1/3 √3)/(1 + 1/2 √3 . 1/3 √3)
= (3/6 √3 - 2/6 √3)/(1 + 1/2)
= (1/6 √3)/(3/2)
= (1/6 √3) . 2/3
= 1/9 √3