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ACOSH(3)	      DragonFly Library Functions Manual	      ACOSH(3)

NAME

acosh, acoshf, acoshl -- inverse hyperbolic cosine functions

SYNOPSIS

#include <math.h> double acosh(double x); float acoshf(float x); long double acoshl(long double x);

DESCRIPTION

The acosh() function computes the inverse hyperbolic cosine of the real argument x. The acoshf() function is a single precision version of acosh(). The acoshl() function is an extended precision version of acosh().

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), infnan(3)

HISTORY

The acosh() function appeared in 4.3BSD. DragonFly 4.3 November 3, 2013 DragonFly 4.3