Построить график функции

uses graphABC;
function F(x:real):real;
begin
F:=x*x-ln(x)-2*cos(x)-1;
end;
var x,max,min,mx,my,a,b:real;
    x0,y0,i:integer;
    s:string;
begin
a:=0.01;
b:=3;
max:=F(a);
min:=F(a);
x:=a;
while x<=b do
 begin
  if F(x)>max then max:=F(x);
  if F(x)<min then min:=F(x);
  x:=x+0.01;
 end;
x0:=50;
y0:=round(max*windowheight/(max-min))-50;
mx:=(windowwidth-x0-30)/b;
my:=(y0-30)/max;
line(0,y0,windowwidth,y0);
line(x0,0,x0,windowheight);
for i:=1 to 10 do
 begin
  line(x0+round(i*mx/2),y0-3,x0+round(i*mx/2),y0+3);
  textout(x0+round(i*mx/2),y0+10,floattostr(i/2));
  line(x0-3,y0+round(i*my),x0+3,y0+round(i*my));
  line(x0-3,y0-round(i*my),x0+3,y0-round(i*my));
  textout(x0-25,y0-round(i*my),inttostr(i));
  textout(x0-20,y0+round(i*my),inttostr(-i));
 end;
textout(x0+5,y0+10,'0');
textout(windowwidth-10,y0-15,'X');
textout(x0+5,10, 'Y');
x:=a;
while x<=b do
 begin
  setpixel(x0+round(x*mx),y0-round(F(x)*my),clBlue);
  x:=x+0.001;
 end;
setfontsize(12);
textout(x0+50,10,'F(x)=x^2-ln(x)-2cos(x)-1)');
textout(x0+80,30,'интервал [0;3]');
end.