| sin(a) | = √(1 - cos²(a) = 4/5Поскольку п<a<3/2п , то sin(a) = - 4/5tg(a) = sin(a)/cos(a) = (- 4/5 ) / (-3/5) = 4/3
| sin(a) | = √(1 - cos²(a) = 4/5
Поскольку п<a<3/2п , то sin(a) = - 4/5
tg(a) = sin(a)/cos(a) = (- 4/5 ) / (-3/5) = 4/3