При компиляции выдаёт ошибку "Declaration syntax error"

#include <vcl.h>
#pragma hdrstop
#include <math>
#include "Project2.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
typedef double (*TFun)(double);
double fun1(double);
double fun2(double);
void Out_Rez(TFun, double, double, double, TMemo *mem);
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormCreate(TObject *Sender)
{
Edit1->Text="0,1";
Edit2->Text="3";
Edit3->Text="0,3";
Edit4->Text="3";
Memo1->Clear();
RadioGroup1->ItemIndex=0;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
double a, b, h, n;
a = StrToFloat(Edit1->Text);
b = StrToFloat(Edit2->Text);
h = StrToFloat(Edit3->Text);
n = StrToFloat(Edit4->Text);
switch(RadioGroup1->ItemIndex)
{
case 0: Memo1->Lines->Add("Y(x)");Out_Rez (fun1,a,b,h,Memo1); break;
case 1: Memo1->Lines->Add("Y(x)");Out_Rez (fun2,a,b,h,Memo1); break;
}
}
//---------------------------------------------------------------------------
double fun1(double x){
return 2*(pow(cos(x),2.)-1);}
 double fun2(double x){
 float sum=0;
 double a; double b; double h; double k; double n;
         for (x=a; x<=b; x+=h) {
         for (k=1; k<=n; k++) {
             int   fk=1;
                for (int j=1; j<=2*k; j++) fk=fk*j;
                if (k==0) fk=1;
                sum+=pow((-1), k)*pow(2.*x,2.*k)/(fk);}
 
         return(sum);}
  void Out_Rez (TFun f,double xn,double xk,double h,TMemo *mem)
   {for(double x=xn; x<=xk; x+=h)
   mem->Lines->Add(" x = "+FloatToStrF(x,ffFixed,8,2)+
   "\t fun(x)="+FloatToStrF(f(x),ffFixed,8,8)); };}