kill(all)$

fpprintprec:10;

van=facebook.com/LearningCalculus;

angle:atan((sqrt(10-2*sqrt(5))*(-134*sqrt(6*5^(3/2)+150)+31*sqrt(150-6*5^(3/2))+
332*sqrt(6*sqrt(5)+30)-672*sqrt(5)+31*sqrt(30-6*sqrt(5))+1080)+
1682*sqrt(2*5^(3/2)+50)+206*sqrt(50-2*5^(3/2))-
3950*sqrt(2*sqrt(5)+10)+8*3^(11/2)*sqrt(5)-110*sqrt(10-2*sqrt(5))-5320*
sqrt(3))/(-358*sqrt(6*5^(3/2)+150)+sqrt(10-2*sqrt(5))*(92*sqrt(2*5^(3/2)+50)+
133*sqrt(50-2*5^(3/2))-362*sqrt(2*sqrt(5)+10)+
208*3^(3/2)*sqrt(5)-471*sqrt(10-2*sqrt(5))-1400*sqrt(3))
-110*sqrt(150-6*5^(3/2))+610*sqrt(6*sqrt(5)+30)-1784*sqrt(5)+
390*sqrt(30-6*sqrt(5))+5800))$

float(angle) * radians;

float(angle*180/%pi) * degrees;