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sec²x = 1+tan²x
Maka,
1+tan²x + 2tan x = 4
tan²x + 2.tan x - 3 = 0
(tan x + 3)(tan x - 1) = 0
Dengan tan x = -3, didapat dalam radian x = {1,8925; 5,0341}
Dengan tan x = 1, didapat dalam radian x = {π/4, 5π/4}