Section (3) tanh
tanh, tanhf, tanhl — hyperbolic tangent function
||long double x
These functions return the hyperbolic tangent of
x, which is defined
tanh(x) = sinh(x) / cosh(x)
On success, these functions return the hyperbolic tangent
x is a NaN, a
NaN is returned.
x is +0
(−0), +0 (−0) is returned.
x is positive
infinity (negative infinity), +1 (−1) is returned.
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.
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Linux libc source code
Lewine_zsingle_quotesz_s _POSIX Programmer_zsingle_quotesz_s Guide_ (O_zsingle_quotesz_Reilly & Associates, 1991)
386BSD man pages
Modified 1993-07-24 by Rik Faith (faithcs.unc.edu)
Modified 2002-07-27 by Walter Harms