himpunan penyelesaian dari 2 sin (3x-30)-1 = 0

2 sin(3x-30) -1 = 0
2 sin(3x-30) = 1
sin(3x-30) = ½
sin(3x-30) = sin 30° V sin 150°

a. sin(3x-30) = sin 30
3x - 30 = 30 + k.360
3x = 60 + k.360
x = 20 + k.120
k=0 — x = 20
k=1 — x = 140
k=2 — x = 260
k=3 — x = 380
...

b. sin(3x-30) = sin150°
3x -30 = 150 + k.360
3x = 180 + k.360
x = 60 + k.120
k=0 — x = 60
k=1 — x = 180
k=2 — x = 300
k=3 — x = 420
...

HP {20,60,140,180,260,300,380,420,...}

Semoga membantu. maaf kalau salah