acosh(3) - NetBSD Manual Pages

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ACOSH(3)                NetBSD Library Functions Manual               ACOSH(3)


NAME
acosh, acoshf, acoshl -- inverse hyperbolic cosine function
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h> double acosh(double x); float acoshf(float x); long double acoshl(long double x);
DESCRIPTION
The acosh(), acoshf(), and acoshl() functions compute the inverse hyper- bolic cosine of the real argument x.
RETURN VALUES
If x is less than one, acosh(x), acoshf(x), and acoshl(x) return NaN and set the global variable errno to EDOM.
SEE ALSO
asinh(3), atanh(3), exp(3), math(3)
STANDARDS
The acosh() function conforms to ISO/IEC 9899:1999 (``ISO C99'').
HISTORY
The acosh() function appeared in 4.3BSD. NetBSD 7.0 January 29, 2013 NetBSD 7.0
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