program Project2;
var
i:integer;
x,y,z:double;
function F(x,y,z:double):double;
var t1,t2,t3:double;
begin
t1 := sqr(sin(x+y));
t2 := 2+ abs(x - (2*x)/(1 +sqr(x*y)));
F := (t1/t2)/sqr(cos(arctan(1/z)));
end;
begin
write('x=');readln(x);
write('y=');readln(y);
write('z=');readln(z);
writeln('F = ',F(x,y,z):17:6);
readln;
end.