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Verified answer
Bab TrigonometriMatematika SMA Kelas X
2 cos² x + 3 . cos x - 2 = 0
(2 cos x - 1) (cos x + 2) = 0
2 cos x - 1 = 0
2 cos x = 1
cos x = 1/2
x = 60°
cos x + 2 = 0
cos x = -2 (tidak memenuhi, nilai minimum cos x adalah -1)
HP = { 60° }
Verified answer
(2cos x - 1) (cos x + 2) = 02cos - 1= 0
2cos x = 1
cos x = 1/2
cos x = cos 60, 120 ( 120 tidak dipakai karena x < 90.
cos x - 2 = 0
cos x = 2 ( tidak ada cos berharga 2)
Jadi HP = { 60 }