とりあえず>>644の設定でいいならsの満たすべき方程式は
-((12*sin(s)^2+12*cos(s)^2−12*cos(s)+3)*sin(2*s)−24*sin(s)^3+(24*s−8*%pi+2*3^(3/2))*sin(s)^2−24*s*cos(s)^2+24*s*cos(s)−6*s)/(48*cos(s)^2−48*cos(s)+12)
= π/8。
近似解は
s=.8486751477323029=48.6255041427026°