log10f man page on FreeBSD

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

NAME
log, logf, logl, log10, log10f, log1p, log1pf — logarithm functions

LIBRARY
Math Library (libm, -lm)

SYNOPSIS
#include <math.h>

double
log(double x);

float
logf(float x);

double
log10(double x);

float
log10f(float x);

double
log1p(double x);

float
log1pf(float x);

DESCRIPTION
The log() and logf() functions compute the natural logarithm of x.

The log10() and log10f() functions compute the logarithm base 10 of x.

The log1p() and log1pf() functions compute the natural logarithm of 1 +
x.	 Computing the natural logarithm as log1p(x) is more accurate than
computing it as log(1 + x) when x is close to zero.

RETURN VALUES
These functions return the requested logarithm; the logarithm of 1 is +0.
An attempt to take the logarithm of ±0 results in a divide-by-zero excep‐
tion, and -∞ is returned.	Otherwise, attempting to take the logarithm of
a negative number results in an invalid exception and a return value of
NaN.

SEE ALSO
exp(3), ilogb(3), math(3), pow(3)

STANDARDS
The log(), logf(), log10(), log10f(), log1p(), and log1pf() functions
conform to ISO/IEC 9899:1999 (“ISO C99”).

BSD			       January 17, 2008				   BSD
```
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