tan^2 x-2 tan x-8 = 0 nilai cos x pada interval 0< x <180

Bab Trigonometri
Matematika SMA Kelas X

tan² x - 2 tan x - 8 = 0
(tan x - 4) (tan x + 2) = 0
tan x = 4
x = 75,96°

tan x = -2
x = -63,43°
x = 180° + (-63,43°)
x = 116,57°

HP = { 75,96° , 116,57° }