double binarySearch(double x1, double x2, double tol){
double x = (x1+x2)/2;
if (abs(eval(x))<tol){
return x;
}
else{
if(eval(x)<0){
binarySearch(x, x2, tol);
}
else{
binarySearch(x1,x,tol);
}
}
}
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