double echebser0 ( double x, double coef[], int nc );
double echebser1 ( double x, double coef[], int nc, double &y1 );
double echebser2 ( double x, double coef[], int nc, double &y1, double &y2 );
double echebser3 ( double x, double coef[], int nc, double &y1, double &y2,
  double &y3 );
double echebser4 ( double x, double coef[], int nc, double &y1, double &y2,
  double &y3, double &y4 );

double evenchebser0 ( double x, double coef[], int nc );
double evenchebser1 ( double x, double coef[], int nc, double &y1 );
double evenchebser2 ( double x, double coef[], int nc, double &y1, double &y2 );

double oddchebser0 ( double x, double coef[], int nc );
double oddchebser1 ( double x, double coef[], int nc, double &y1 );
double oddchebser2 ( double x, double coef[], int nc, double &y1, double &y2 );

void timestamp ( );