1*48924Scael.\" Copyright (c) 1991 The Regents of the University of California. 2*48924Scael.\" All rights reserved. 3*48924Scael.\" 4*48924Scael.\" %sccs.include.redist.man% 5*48924Scael.\" 6*48924Scael.\" @(#)tanh.3 5.1 (Berkeley) 05/02/91 7*48924Scael.\" 8*48924Scael.Dd 9*48924Scael.Dt TANH 3 10*48924Scael.Os 11*48924Scael.Sh NAME 12*48924Scael.Nm tanh 13*48924Scael.Nd hyperbolic tangent function 14*48924Scael.Sh SYNOPSIS 15*48924Scael.Fd #include <math.h> 16*48924Scael.Ft double 17*48924Scael.Fn tanh "double x" 18*48924Scael.Sh DESCRIPTION 19*48924ScaelThe 20*48924Scael.Fn tanh 21*48924Scaelfunction computes the hyperbolic tangent of 22*48924Scael.Fa x . 23*48924ScaelFor a discussion of error due to roundoff, see 24*48924Scael.Xr math 3 . 25*48924Scael.Sh RETURN VALUES 26*48924ScaelThe 27*48924Scael.Fn tanh 28*48924Scaelfunction returns the hyperbolic tangent value. 29*48924Scael.Sh SEE ALSO 30*48924Scael.Xr acos 3 , 31*48924Scael.Xr asin 3 , 32*48924Scael.Xr atan 3 , 33*48924Scael.Xr atan2 3 , 34*48924Scael.Xr cos 3 , 35*48924Scael.Xr cosh 3 , 36*48924Scael.Xr sin 3 , 37*48924Scael.Xr sinh 3 , 38*48924Scael.Xr tan 3 , 39*48924Scael.Xr math 3 , 40*48924Scael.Sh STANDARDS 41*48924ScaelThe 42*48924Scael.Fn tanh 43*48924Scaelfunction conforms to 44*48924Scael.St -ansiC . 45