1.\" Copyright (c) 1985, 1991 Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" %sccs.include.redist.man% 5.\" 6.\" @(#)asinh.3 6.3 (Berkeley) 04/19/91 7.\" 8.Dd 9.Dt ASINH 3 10.Os BSD 4.3 11.Sh NAME 12.Nm asinh 13.Nd inverse hyperbolic sine function 14.Sh SYNOPSIS 15.Fd #include <math.h> 16.Ft double 17.Fn asinh "double x" 18.Sh DESCRIPTION 19The 20.Fn asinh 21function computes the inverse hyperbolic sine 22of the real 23argument 24.Ar x . 25For a discussion of error due to roundoff, see 26.Xr math 3 . 27.Sh RETURN VALUES 28The 29.Fn asinh 30function 31returns the inverse hyperbolic sine of 32.Ar x . 33.Sh SEE ALSO 34.Xr acosh 3 , 35.Xr atanh 3 , 36.Xr exp 3 , 37.Xr infnan 3 38.Xr math 3 , 39.Sh AUTHOR 40.An W. Kahan , 41.An Kwok\-Choi Ng 42.Sh HISTORY 43The 44.Fn asinh 45function appeared in 46.Bx 4.3 . 47