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ACOSH
Section: Linux Programmer's Manual (3)Updated: 1993-06-13
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NAME
acosh - inverse hyperbolic cosine functionSYNOPSIS
#include <math.h> double acosh(double x);
DESCRIPTION
The acosh() function calculates the inverse hyperbolic cosine of x; that is the value whose hyperbolic cosine is x. If x is less than 1.0, acosh() returns not-a-number (NaN) and errno is set.ERRORS
- EDOM
- x is out of range.
CONFORMING TO
SVID 3, POSIX, BSD 4.3, ISO 9899SEE ALSO
asinh(3), atanh(3), cosh(3), sinh(3), tanh(3)