Manpages - tanh.3

tanh, 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)):

*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).

C99, POSIX.1-2001, POSIX.1-2008.

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

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

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