TANH(3) BSD Library Functions Manual TANH(3)
NAME
tanh, tanhf -- hyperbolic tangent function
LIBRARY
Math Library (libm, -lm)
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 NaN, a NaN 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 ISO/IEC 9899:1999 (``ISO C99'').
BSD
September 18, 2011 BSD
