This module is a translation of the C math.h file. It exports the following
selected constants and functions:
M_1_PI M_2_PI M_2_SQRTPI M_E M_LN10 M_LN2 M_LOG10E
M_LOG2E M_PI M_PI_2 M_PI_4 M_SQRT1_2 M_SQRT2
acos acosh asin asinh atan atanh cbrt ceil cosh
erf erfc expm1 floor hypot j0 j1 jn lgamma_r
log10 log1p pow rint sinh tan tanh y0 y1 yn