Program Ex_7;
uses crt;
var a,y,x,yy:real;
begin clrscr;
writeln(' [y_1;y_2] ');
write('y_1'); readln(y);
write('y_2'); readln(yy);
writeln('y ',' a ',' x');
while (y<=yy) do
begin
a:=ln(y)/ln(2);
x:=1-2*cos(a*y)+ln(y);
writeln(y:5:1,a:5:1,x:5:1);
y:=y+Pi/4;
end;
readln
end.