a) sin(a-3П/2) = sin(a)cos(3П/2) - cos(a)sin(3П/2) = sin(a)0 - cos(a)(-1) = cos(a)
б) cos(a-3П/2) = cos(a)cos(3П/2) + sin(a)sin(3П/2) = cos(a)0 + sin(a)(-1) = -sin(a)
в) tg(a-2П) = tg(a) = sin(a)/cos(a)
a) sin(a-3П/2) = sin(a)cos(3П/2) - cos(a)sin(3П/2) = sin(a)0 - cos(a)(-1) = cos(a)
б) cos(a-3П/2) = cos(a)cos(3П/2) + sin(a)sin(3П/2) = cos(a)0 + sin(a)(-1) = -sin(a)
в) tg(a-2П) = tg(a) = sin(a)/cos(a)