TANH(3)

NAME
tanh, tanhf - hyperbolic tangent function

LIBRARY
libm

SYNOPSIS
#include <math.h>
double
tanh(double x);
float
tanhf(float x);

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

RETURN VALUES
Upon successful completion, these functions return the hyperbolic tangent value. The following may also occur:

1.  If x is 0, x is returned.

2.  If x is , a is returned.

3.  If x is positive infinity, a value 1 is returned; if x is negative infinity, -1 is returned.

4.  If x is subnormal, a range error can occur and x is returned.

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

STANDARDS
The described functions conform to isoC-99.