acosh(3) - NetBSD Manual Pages

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


NAME

     acosh, acoshf -- inverse hyperbolic cosine function


LIBRARY

     Math Library (libm, -lm)


SYNOPSIS

     #include <math.h>

     double
     acosh(double x);

     float
     acoshf(float x);


DESCRIPTION

     The acosh() and acoshf() functions compute the inverse hyperbolic cosine
     of the real argument x.


RETURN VALUES

     If x is less than one, acosh(x) and acoshf(x) return NaN and set the
     global variable errno to EDOM.


SEE ALSO

     asinh(3), atanh(3), exp(3), math(3)


HISTORY

     The acosh() function appeared in 4.3BSD.

NetBSD 6.0                        May 6, 1991                       NetBSD 6.0