1) 15° = 15° * п/180 = п/12
18° = 18° * п/180 = п/10
108° = 108° * п/180 = 3п/5
720° = 720° * п/180 = 4п
2) п/18 = п/18 * 180/п = 10°
7п/10 = 7п/10 * 180/п =126°
13п/4 = 13п/4 * 180/п = 585°
3) 30° 150° 270° 300° -30°
sin x 1/2 1/2 -1 √3/2 1/2
cos x √3/2 √3/2 0 1/2 √3/2
tg x 1/√3 1/√3 - -√3 -1/√3