1*61309Sbostic.\" Copyright (c) 1991, 1993 2*61309Sbostic.\" The Regents of the University of California. All rights reserved. 348924Scael.\" 448924Scael.\" %sccs.include.redist.man% 548924Scael.\" 6*61309Sbostic.\" @(#)tanh.3 8.1 (Berkeley) 06/04/93 748924Scael.\" 848924Scael.Dd 948924Scael.Dt TANH 3 1048924Scael.Os 1148924Scael.Sh NAME 1248924Scael.Nm tanh 1348924Scael.Nd hyperbolic tangent function 1448924Scael.Sh SYNOPSIS 1548924Scael.Fd #include <math.h> 1648924Scael.Ft double 1748924Scael.Fn tanh "double x" 1848924Scael.Sh DESCRIPTION 1948924ScaelThe 2048924Scael.Fn tanh 2148924Scaelfunction computes the hyperbolic tangent of 2248924Scael.Fa x . 2348924ScaelFor a discussion of error due to roundoff, see 2448924Scael.Xr math 3 . 2548924Scael.Sh RETURN VALUES 2648924ScaelThe 2748924Scael.Fn tanh 2848924Scaelfunction returns the hyperbolic tangent value. 2948924Scael.Sh SEE ALSO 3048924Scael.Xr acos 3 , 3148924Scael.Xr asin 3 , 3248924Scael.Xr atan 3 , 3348924Scael.Xr atan2 3 , 3448924Scael.Xr cos 3 , 3548924Scael.Xr cosh 3 , 3648924Scael.Xr sin 3 , 3748924Scael.Xr sinh 3 , 3848924Scael.Xr tan 3 , 3948924Scael.Xr math 3 , 4048924Scael.Sh STANDARDS 4148924ScaelThe 4248924Scael.Fn tanh 4348924Scaelfunction conforms to 4448924Scael.St -ansiC . 45