ACOSH(3) BSD Programmer's Manual ACOSH(3)
acosh, acoshf - inverse hyperbolic cosine function
#include <math.h> double acosh(double x); float acoshf(float x);
The acosh() and acoshf() functions compute the inverse hyperbolic cosine of the real argument x.
If x is less than one, acosh(x) and acoshf(x) return NaN and set the glo- bal variable errno to EDOM.
asinh(3), atanh(3), exp(3), math(3)
The acosh() function appeared in 4.3BSD. MirOS BSD #10-current May 6, 1991 1
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