Помогите написать программу построения графика функции в графическом режиме.Y=cos(x^2). Pascal.

uses  graphABC; const  W = 800;  H = 500;function F(x: real): real;begin  F := cos(x * x); end;var  x0, y0, x, y, xLeft, yLeft, xRight, yRight, n: integer;  a, b, fmin, fmax, x1, y1, mx, my, dx, dy, num: real;  i: byte;  s: string;begin  SetWindowSize(W, H);   xLeft := 50;  yLeft := 50;  xRight := W - 50;  yRight := H - 50;  a := -2;b := 6;dx := 0.5;  fmin := -10;fmax := 20;dy := 2;  mx := (xRight - xLeft) / (b - a);   my := (yRight - yLeft) / (fmax - fmin);   x0 := trunc(abs(a) * mx) + xLeft;  y0 := yRight - trunc(abs(fmin) * my);  line(xLeft, y0, xRight + 10, y0);   line(x0, yLeft - 10, x0, yRight);   SetFontSize(12);   SetFontColor(clBlue);   TextOut(xRight + 20, y0 - 15, 'X');   TextOut(x0 - 10, yLeft - 30, 'Y');   SetFontSize(8);   SetFontColor(clRed);   n := round((b - a) / dx) + 1;   for i := 1 to n do  begin    num := a + (i - 1) * dx;     x := xLeft + trunc(mx * (num - a));     Line(x, y0 - 3, x, y0 + 3);     str(Num:0:1, s);    if abs(num) > 1E-15 then       TextOut(x - TextWidth(s) div 2, y0 + 10, s)  end;  n := round((fmax - fmin) / dy) + 1;   for i := 1 to n do  begin    num := fMin + (i - 1) * dy;     y := yRight - trunc(my * (num - fmin));    Line(x0 - 3, y, x0 + 3, y);     str(num:0:0, s);    if abs(num) > 1E-15 then       TextOut(x0 + 7, y - TextHeight(s) div 2, s)  end;  TextOut(x0 - 10, y0 + 10, '0');   x1 := a;   while x1 <= b do  begin    y1 := F(x1);     x := x0 + round(x1 * mx);     y := y0 - round(y1 * my);     if (y >= yLeft) and (y <= yRight) then SetPixel(x, y, clGreen);    x1 := x1 + 0.001  endend.