Like this (example from here):
#include <iostream>
#include "symbolicc++.h"
using namespace std;
int main(void)
{
Symbolic x("x");
cout << integrate(x+1, x); // => 1/2*x^(2)+x
Symbolic y("y");
cout << df(y, x); // => 0
cout << df(y[x], x); // => df(y[x],x)
cout << df(exp(cos(y[x])), x); // => -sin(y[x])*df(y[x],x)*e^cos(y[x])
return 0;
}