double f0(double x);

double f1(double x);

double f2(double x);

double f3(double x);

double f4(double x);

double f5(double x);

double f6(double x);

double d0(double x);

double d1(double x);

double d2(double x);

double d3(double x);

double d4(double x);

double d5(double x);

double d6(double x);

int eq(double a, double b);

int sign_eq(double a, double b);

int newton(double x, int n, double* a, double* b, double* ans);

unsigned int get_count(void);

void parabola(double x1, double x2, double x3, double y1, double y2, double y3, double* A, double* B, double* C);