Преобразуйте выражение 1)sin(-225) 2)sin7п/6 3)cos(-4п/3) 4)tg(-240) 5)cos25п/3 6)сtg(-9g/4) 7)sin (-17п/6)

1) sin(−225°) = sin(360°−225°) = sin135° = sin(90°+45°) = cos45° = sqrt(2)/2
2) sin(7П/6) = sin(П+П/6) = −sin(П/6) = −1/2
3) cos(−4П/3) = cos(−П−П/3) = cos(П+П/3) = −cos(П/3) = −1/2
4) tg(−240°) = tg(360°−240°) = tg120° = tg(90°+30°) = −ctg30° = −sqrt(3)
5) cos(25П/3) = cos(8П+П/3) = cos(П/3) = 1/2
6) сtg(−9П/4) = ctg(−2П−П/4) = −ctg(2П+П/4) = −ctg(П/4) = −1
7) sin(−17П/6) = sin(−2П−5П/6) = −sin(2П+5П/6) = −sin(5П/6) = −sin(П−П/6) = −sin(П/6) = −1/2

sqrt(2) - квадратный корень из числа 2
sqrt(3) - квадратный корень из числа 3