Как исправить формулу, чтобы компиляция прошла успешно?

#include <iostream>
#include <cmath.>
using namespace std;
/* run this program using the console pauser or add your own getch, system("pause") or input loop */
int main(int argc, char** argv) {
setlocale (LC_ALL,"Russian");
double p;
float r,z,x;
x= 3.258;
r= 4.005;
z= -0.666;
double exp=2.72;
p= ((exp(х)-2)/(z+3))+(sqrt(sin*(pow(x,5))))-((pow(r,3)+1))/((pow(cos,2))*(r-2)+1);
cout <<"znaxenie p ="; cout <<p<<endl;
system("pause");
return 0;

#include <iostream>
#include <cmath>
using namespace std;
/* run this program using the console pauser or add your own getch, system("pause") or input loop */
int main(int argc, char** argv) {
    setlocale(LC_ALL, "Russian");
    double p;
    float r, z, x;
    x = 3.258;
    r = 4.005;
    z = -0.666;
    //double exp = 2.72;
    p = ((exp(x) - 2) / (z + 3)) + (sqrt(sin(pow(x, 5)))) - ((pow(r, 3) + 1)) / (cos(r - 2)*cos(r - 2) + 1);
    cout << "znaxenie p ="; cout << p << endl;
    system("pause");
    return 0;
}

#include <iostream>
#include <cmath.>
using namespace std;
/* run this program using the console pauser or add your own getch, system("pause") or input loop */
int main(int argc, char** argv) {
setlocale (LC_ALL,"Russian");
double p;
float r,z,x,a,b,c;
x= 3.258;
r= 4.005;
z= -0.666;
double exp=2.72;
a= (exp(x)-2)/(z+3) // что не так с экспонентой? выдает ошибку [Error] 'exp' cannot be used as a function
b= (sqrt(sin*(pow(x,5))))
c=((pow(r,3)+1))/((pow(cos,2))*(r-2)+1);
p=a+b-c;
cout <<"znaxenie p ="; cout <<p<<endl;
system("pause");
return 0;
}

double exp=2.72;

double ex=2.72;

#include <iostream>
#include <cmath>
using namespace std;
 
int main(int argc, char** argv) 
{    
    double x=3.258, r=4.005, z=-0.666, c, p, eps=1e-9;
    
    c=cos(r-2.);
    
    if (z==-3. || sin(pow(x,5))<-eps) cout << "p not determined\n";
    else
    {
    p=(exp(x)-2.)/(z+3.)+sqrt(sin(pow(x,5)))-(r*r*r+1.)/(c*c+1.);    
    cout << "p="; cout << p << "\n";
    }
system("pause");
return 0;
}