solve it

#include <iostream>
#include <string>
#include <math.h>

using namespace std;

double EPS = 0.00001;
int p,q,r,s,t,u;

double F(double);
double derF(double x);
double findRoot();

int main(){

    while(cin >> p >> q >> r >> s >> t >> u){

        if(F(0) * F(1) > 0) cout << "No Solution" << endl;
        else cout << findRoot() << endl;
    }

}


double F(double x){
    return p*exp(-x) + q*sin(x) + r*cos(x) + s*tan(x) +t*x*x + u;
}

double derF(double x){
    return -p*exp(-x) + q*cos(x) - r*sin(x) + s/(cos(x)* cos(x)) + 2*t*x;
}

double findRoot(){

    if (F(0)== 0) return 0;

    for(double x = 0.5; ;){
        double x1 = x - F(x)/derF(x);
        if(fabs(x1-x) < EPS) return x;
        x = x1;
    }

}