acosf man page on FreeBSD

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[printable version]

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

NAME
acos, acosf, acosl — arc cosine functions

LIBRARY
Math Library (libm, -lm)

SYNOPSIS
#include <math.h>

double
acos(double x);

float
acosf(float x);

long double
acosl(long double x);

DESCRIPTION
The acos(), acosf(), and acosl() functions compute the principal value of
the arc cosine of x.

RETURN VALUES
These functions return the arc cosine in the range [0, π] radians.	 If:

|x| > 1,

acos(x) raises an invalid exception and returns an NaN.

asin(3), atan(3), atan2(3), cos(3), cosh(3), fenv(3), math(3), sin(3),
sinh(3), tan(3), tanh(3)

STANDARDS
The acos(), acosf(), and acosl() functions conform to ISO/IEC 9899:1999
(“ISO C99”).

BSD				 July 31, 2008				   BSD
```
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