cot x = 1/2 maka tan 2x?

Materi : Trigonometri

Pembahasan :
Cot x = 1/2
Tan x = 2

Tan 2x
= Tan (x + x)
= (Tan x + Tan x)/(1 - Tan x . Tan x)
= (2Tan x)/(1 - Tan²x)
= (2 . 2)/(1 - 2²)
= 4/(1 - 4)
= 4/(-3)
= - 4/3