tanh - Man Page

Math library (libm, -lm)

#include <math.h>

double tanh(double x);
float tanhf(float x);
long double tanhl(long double x);

tanhf(), tanhl():

    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
        || /* Since glibc 2.19: */ _DEFAULT_SOURCE
        || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

These functions return the hyperbolic tangent of x, which is defined mathematically as:

    tanh(x) = sinh(x) / cosh(x)

On 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.

If x is positive infinity (negative infinity), +1 (-1) is returned.

No errors occur.

For an explanation of the terms used in this section, see attributes(7).

C11, POSIX.1-2008.

C99, POSIX.1-2001.

The variant returning double also conforms to SVr4, 4.3BSD, C89.

acosh(3), asinh(3), atanh(3), cosh(3), ctanh(3), sinh(3)

acosh(3), asinh(3), atanh(3), cosh(3), sinh(3).

The man pages tanhf(3) and tanhl(3) are aliases of tanh(3).