ipiq: Add simple IPI latency measure sysctls (2)
[dragonfly.git] / lib / libm / man / acosh.3
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1.\" Copyright (c) 1991 Regents of the University of California.
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28.\" from: @(#)acosh.3 5.2 (Berkeley) 5/6/91
a8a6a916 29.\" $FreeBSD: head/lib/msun/man/acosh.3 251599 2013-06-10 06:04:58Z das $
b34b60bc 30.\"
a8a6a916 31.Dd June 11, 2013
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32.Dt ACOSH 3
33.Os
34.Sh NAME
35.Nm acosh ,
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36.Nm acoshf ,
37.Nm acoshl
8cecb502 38.Nd inverse hyperbolic cosine functions
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39.Sh LIBRARY
40.Lb libm
41.Sh SYNOPSIS
42.In math.h
43.Ft double
44.Fn acosh "double x"
45.Ft float
46.Fn acoshf "float x"
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47.Ft long double
48.Fn acoshl "long double x"
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49.Sh DESCRIPTION
50The
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51.Fn acosh ,
52.Fn acoshf ,
53and
54.Fn acoshl
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55functions compute the inverse hyperbolic cosine
56of the real
57argument
58.Ar x .
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59For a discussion of error due to roundoff, see
60.Xr math 3 .
b34b60bc 61.Sh RETURN VALUES
a8a6a916 62These functions
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63return the inverse hyperbolic cosine of
64.Ar x .
65If the argument is less than 1,
66.Fn acosh
67raises an invalid exception and returns an \*(Na.
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68.Sh SEE ALSO
69.Xr asinh 3 ,
70.Xr atanh 3 ,
71.Xr exp 3 ,
8cecb502 72.Xr fenv 3 ,
b34b60bc 73.Xr math 3
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74.Sh HISTORY
75The
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76.Fn acosh ,
77.Fn acoshf ,
78and
79.Fn acoshl
80functions appeared in
81.Bx 4.3 ,
82.Fx 2.0 ,
83and
84.Dx 3.5 ,
85respectively.