himpunan penyelesaian persamaan 4+2 sin (x-25°)=3 pada interval 0°

persamaan trigonometri

4 + 2 sin(x-25)= 3
2 sin (x-25) = 3-4 = -1
sin (x - 25) = -1/2
.
1) sin (x - 25) =-1/2 = sin (180+30)
x - 25 = 210
x = 235

2) sin (x -25) =-1/2 = sin(360-30)
x - 25 = 330
x = 355

jika intrerval 0 ≤ x ≤ 360
x = 235°