# math

float sqrt (float x)
{
  ...
}

float64 sqrt (float64 x)
{
  ...
}

ulong -a fp_eq (float x, float standard, float epsilon, float fp_delta)
{
  ...
}

ulong -a is_nan (float x)
             -> (ulong -w not_a_number = 0)
{
  ...
}

...

# >> fp_eq, is_nan,
     exp, ln, pow, sqrt,
     sin, cos, tn, ctn, atn, actn
