Manual Section... (3) - page: tanh
NAMEtanh, tanhf, tanhl - hyperbolic tangent function
#include <math.h> double tanh(double x);
float tanhf(float x);
long double tanhl(long double x);
Link with -lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
DESCRIPTIONThe tanh() function returns the hyperbolic tangent of x, which is defined mathematically as:
tanh(x) = sinh(x) / cosh(x)
RETURN VALUEOn success, these functions return the hyperbolic tangent of x.
If x is a NaN, a NaN is returned.
If x is +0 (-0), +0 (-0) is returned.
ERRORSNo errors occur.
CONFORMING TOC99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89.
SEE ALSOacosh(3), asinh(3), atanh(3), cosh(3), ctanh(3), sinh(3)
COLOPHONThis page is part of release 3.24 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.
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Time: 15:26:45 GMT, June 11, 2010