asinh.3m

来自「<B>Digital的Unix操作系统VAX 4.2源码</B>」· 3M 代码 · 共 36 行

.\" SCCSID: @(#)asinh.3m	8.1	9/11/90
.TH asinh 3m VAX
.SH Name
asinh, acosh, atanh \- inverse hyperbolic functions
.SH Syntax
.nf
.B #include <math.h>
.PP
.B double asinh(x)
.B double x;
.PP
.B double acosh(x)
.B double x;
.PP
.B double atanh(x)
.B double x;
.fi
.SH Description
.NXR "asinh subroutine"
.NXR "acosh subroutine"
.NXR "atanh subroutine"
.NXR "hyperbolic function" "inverse"
These functions compute the designated inverse hyperbolic functions for real
arguments.
.SH Return Values
The function
.PN acosh
returns 0.0 if the argument is less than 1.
.PP
The function
.PN atanh 
returns the HUGE value if the argument has absolute
value greater than or equal to 1.
.SH See Also
exp(3m), intro(3m)