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NetBSD 6.1.5 - man page for acosh (netbsd section 3)

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ACOSH(3)			   BSD 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 argu-
     ment 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.

BSD					   May 6, 1991					      BSD
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