9+(30х-100)=2
9+30х-100=2
30х=2-9+100
30х=93
х=93:30
х=3,1
Π=180°
1°=π/180°
1) 40 = 40°π/180° = 2π/9
2) 120° = 120°π/180° = 2π/3
3) 150° = 150°π/180° = 5π/6
4) 75° = 75°π/180° = 5π/12
5) 32° = 32°π/180° = 8π/45
6) 140° = 140°π/180° = 7π/9
4cosx - 4sinx - 4sin2x = 0
4cosx - 4sinx - 8sinxcosx = 0 | : 8cosx
2 - 4tgx - tgx = 0
2 - 5tgx = 0
-5tgx = -2
tgx = 2/5
x = arctg2/5 + Pi*n, n € Z