Question 805759
tan(y) = sin(y)/cos(y)<P>
2sin(y) = sin(y)/cos(y)<P>
2sin(y)cos(y)=sin(y)<P>
2cos(y) = sin(y)/sin(y) = 1<P>
cos(y) = 1/2<P>
y = pi/3 + 2pi*n and 5pi/3 + 2pi*n