2 cos(kuadrat)x + cos x - 1 = 0, 0
Matematika
ZainalArifin26
Pertanyaan
2 cos(kuadrat)x + cos x - 1 = 0, 0
1 Jawaban
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1. Jawaban Anonyme
Bab Trigonometri
Matematika SMA Kelas X
2 cos² x + cos x - 1 = 0
(2 cos x - 1) (cos x + 1) = 0
2 cos x - 1 = 0
2 cos x = 1
cos x = 1/2
x = 60° dan 300°
cos x + 1 = 0
cos x = -1
x = 180°
HP = { 60°, 180°, 300°, 0 ≤ x ≤ 360° }