tanh(3) - NetBSD Manual Pages

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TANH(3)                 NetBSD Library Functions Manual                TANH(3)


NAME
tanh, tanhf -- hyperbolic tangent function
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h> double tanh(double x); float tanhf(float x);
DESCRIPTION
The tanh() and tanhf() functions compute the hyperbolic tangent of x. For a discussion of error due to roundoff, see math(3).
RETURN VALUES
Upon successful completion, these functions return the hyperbolic tangent value. The following may also occur: 1. If x is 0, x is returned. 2. If x is NaN, a NaN is returned. 3. If x is positive infinity, a value 1 is returned; if x is neg- ative infinity, -1 is returned. 4. If x is subnormal, a range error can occur and x is returned.
SEE ALSO
acos(3), asin(3), atan(3), atan2(3), cos(3), cosh(3), math(3), sin(3), sinh(3), tan(3)
STANDARDS
The described functions conform to ISO/IEC 9899:1999 (``ISO C99''). NetBSD 9.1 September 18, 2011 NetBSD 9.1
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