var
x, y:real;
begin
writeln('Vvedit x');
readln(x);
begin
y:= sin(sqr(x)-4) + 2/ cos(3*x);
end;
writeln('y=', y:8:4);
readln
end.

var
x, y:real;
begin
writeln('Vvedit x');
readln(x);
y:= (sin(sqr(x)-4) + 2) / cos(3*x);
writeln('y=', y:8:4);
readln
end.