bantuin aku kakak,soalnya dikumpulin besok

3tan²x - 1 = 0
3tan²x = 1
tan²x = ⅓
tan x = √⅓
tan x = 1/√3
tan x = tan 30
x = 30
x = π/6
tan x = tan (180+30)
x = 180+30 = 210
x = (7/6)π