erfc man page on FreeBSD

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```ERF(3)			 BSD Library Functions Manual			ERF(3)

NAME
erf, erff, erfc, erfcf — error function operators

LIBRARY
Math Library (libm, -lm)

SYNOPSIS
#include <math.h>

double
erf(double x);

float
erff(float x);

double
erfc(double x);

float
erfcf(float x);

DESCRIPTION
These functions calculate the error function of x.

The erf() and the erff() functions calculate the error function of x;
where

erf(x) = 2/sqrt(pi)∗integral from 0 to x of exp(-t∗t) dt.

The erfc() and the erfcf() functions calculate the complementary error
function of x; that is erfc() subtracts the result of the error function
erf(x) from 1.0.  This is useful, since for large x places disappear.

math(3)

HISTORY
The erf() and erfc() functions appeared in 4.3BSD.

BSD				April 20, 1991				   BSD
```
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