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cos(-x) = cos x
tan(-x) = - tan x
sin x = - sin 150
sin x = sin(-150)
x = -150 + k . 360
x = (180 + 150) + k . 360
x = 330 + k . 360
maka persamaannya yaitu x = -150 + k . 360 dan x = 330 + k . 360