DragonFly On-Line Manual Pages

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 4.1                  November 3, 2013                  DragonFly 4.1