tanh(3) -- Linux man page
NAME
tanh, tanhf, tanhl - hyperbolic tangent function
SYNOPSIS
#include <math.h>
double tanh(double x);
float tanhf(float x);
long double tanhl(long double x);
DESCRIPTION
The tanh() function returns the hyperbolic tangent of x, which
is defined mathematically as sinh(x) / cosh(x).
CONFORMING TO
SVID 3, POSIX, BSD 4.3, ISO 9899 (C99).
The float and the long double variants are C99 requirements.
SEE ALSO
acosh(3),
asinh(3),
atanh(3),
cosh(3),
sinh(3)
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