1)
2)
3)
1. 1/2;
2. √3/3;
3. 1.
Пошаговое объяснение:
1. cos(19π/3) = cos (6π + π/3) = cos(π/3) = 1/2;
2. tg(31π/6) = tg(5π + π/6) = tg(π/6) = √3/3.
3. ctg (13π/4) = ctg(3π + π/4) = ctgπ/4 = 1.
1)
2)
3)
1. 1/2;
2. √3/3;
3. 1.
Пошаговое объяснение:
1. cos(19π/3) = cos (6π + π/3) = cos(π/3) = 1/2;
2. tg(31π/6) = tg(5π + π/6) = tg(π/6) = √3/3.
3. ctg (13π/4) = ctg(3π + π/4) = ctgπ/4 = 1.