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a)
(sin x - 3)(sin x +1) = 0
sin x = 3 (tm > 1) atau sin x = -1 --> x = 270
b)
(2 cos x - √2)(cos x - √2) =0
cos x = √2 (TM krna nilai cos x > 1) atau cos x = 1/2 √2
2cos x =√2 --> cos x = 1/2 √2 --> x = 45, 315
3) (3 tan x - 1) ( tan x -2 ) = 0
3 tan x = 1 atau tan x = 2
tan x = 1/3 --> x = 18,4
atau tan x = 2 --> x = 63,4