cos (alfa)=(sqr(b)+sqr(c)-sqr(a))/2bc
cos B=(sqr(a)+sqr(c)-sqr(b))/2ac
cos(gamma)=(sqr(a)+sqr(b)-sqr(c))/2ab
var a,b,c:real;
function cosinus(a,b,c:real):real;
begin
cosinus:=(sqr(b)+sqr(c)-sqr(a))/2*b*c;
end;
begin
readln(a,b,c);
writeln(cosinus(a,b,c));
writeln(cosinus(b,c,a));
writeln(cosinus(c,a,b));
end.