freebsd man page for tanh

TANH(3) 						   BSD Library Functions Manual 						   TANH(3)

NAME
     tanh, tanhf, tanhl -- hyperbolic tangent functions

LIBRARY
     Math Library (libm, -lm)

SYNOPSIS
     #include <math.h>

     double
     tanh(double x);

     float
     tanhf(float x);

     long double
     tanhl(long double x);

DESCRIPTION
     The tanh(), tanhf(), and tanhl() functions compute the hyperbolic tangent of x.  For a discussion of error due to roundoff, see math(3).

RETURN VALUES
     The tanh(), tanhf(), and the tanhl() functions return the hyperbolic tangent value.

SEE ALSO
     acos(3), asin(3), atan(3), atan2(3), cos(3), cosh(3), ctanh(3), math(3), sin(3), sinh(3), tan(3)

STANDARDS
     The tanh() function conforms to ISO/IEC 9899:1990 (``ISO C90'').

BSD
								  August 17, 2013							       BSD