program T9;
var
   w: real;
begin
   w := Pi/4;
   writeln(Sin(w));
   writeln(cos(w));
   writeln(tan(w));
   w:=sin(w);
   writeln(arcSin(w)*4);
   writeln(arccos(w)*4);
   w:=tan(Pi/4);
   writeln(arctan(w)*4);
   writeln(arctan2(0,1));
end.