double hypot (double, double) (x, y);
double lgamma double x;
double erf double x;
double erfc double x;
double j0 double x;
double j1 double x;
double jn (int, double) (x, n);
double y0 double x;
double y1 double x;
double yn (int, double) (x, n);
double acos double x;
double asin double x;
double atan double x;
double atan2 (double, double) (x, y);
double cos double x;
double sin double x;
double tan double x;
double cosh double x;
double sinh double x;
double tanh double x;
double exp double x;
double ldexp (double, int) (x, n);
double log double x;
double log10 double x;
double pow (double, double) (x, y);
double sqrt double x;
double ceil double x;
double fabs double x;
double floor double x;
double fmod (double, double) (x, y);