no 3 dan 4 saja ya kak, persamaan trigonometri

1) sin x = -½√3
= sin (60+180) kw III
= sin 240
= sin (360-60) kw IV
= sin 300

HP {240, 300}

2) sin (2x+40) = sin 180
= sin (180+ k.360)
2x+40 = 180+k.360
2x. = 140+ k.360
x. = 70+ k.180

k = 0.....x = 70
k = 1..... x = 250

HP { 70, 250}