double acos(double x);
    double asin(double x);
    double atan(double x);
    double atan2(double y, double x);
    double cos/sin/tan(double x);
    double cosh/sinh/tanh(double x);
    double exp(double x);
    double frexp(double value, int *exp);
    double ldexp(double x, int exp);
    double log (double x);
    double log10(double x);
    double modf(double value, double *iptr);
    double pow(double x, double y);
    double sqrt(double x);
    double ceil(double x);
    double fabs(double x);
    double floor(double x);
    double fmod(double x, double y);