kekkaiisshi
2 sin x .cos x + sin x = 0 (2 cos x +1)sin x = 0 2 cos x + 1 = 0 atau sin x = 0 2cos x + 1 = 0 2 cos x = -1 cos x = -1/2 cos x = cos 120 x = 120 + k.360 atau x = -120 + k.360 k = 0, x = 120, -120 k = 1, x = 480, 240
sin x = 0 sin x = sin 0 x = 0 + k.360 atau x = (180 - 0) + k.360 x = 180 + k.360
(2 cos x +1)sin x = 0
2 cos x + 1 = 0 atau sin x = 0
2cos x + 1 = 0
2 cos x = -1
cos x = -1/2
cos x = cos 120
x = 120 + k.360
atau
x = -120 + k.360
k = 0, x = 120, -120
k = 1, x = 480, 240
sin x = 0
sin x = sin 0
x = 0 + k.360
atau
x = (180 - 0) + k.360
x = 180 + k.360
k = 0, x = 0, 180
k = 1, x = 360, 540