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sec² x = tan² x + 1
tan² x + 1 + √3 tan x - 1 = 0
tan² x + √3 tan x = 0
tan x ( tan x + √3) = 0
tan x = 0 atau tan x = -√3
tan x = 0 -->x = 0, 180
tan x = -√3 = -tan 60 = tan 120 --> x = 120
HP x = 0, 120, 180