sin(150) = sin(180 - 150) = sin(30) = 1/2;
cos(150) = - cos(180 - 150) = -cos(30) = -корень(3)/2;
tg(150) = sin(150)/cos(150) = -корень(3)/3;
ctg(150) = 1/tg(150) = -корень(3);
