Cos(34pi/3)=cos(11pi+pi/3)=-cos(pi/3)=-1/2
cos(pi+a)=-cosa
cos(2pi+a)=cosa
Cos(a) = sqrt(1-(sin(a)^2) = 2*sqrt(6)/5
tg(a) = sin(a)/cos(a) = 1/(2*sqrt(6))
tg(a) = AC/BC
AC = BC*tg(a) = 1/(2*sqrt(6))*6*sqrt(6) = 3
<span>9(0,5у+1)-3,1(1-у)> 5,9+7,2у
4,5Y+9-3,1+3.1y>5,9+7,2y
7,6y+5,9>5,9+7,2y
7,6y>7,2y
7,6y-7,2y>0
0,4y>0
y>0</span>