acosh man page on OpenDarwin

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ACOSH(3)		 BSD Library Functions Manual		      ACOSH(3)

NAME
     acosh — inverse hyperbolic cosine function

SYNOPSIS
     #include <math.h>

     double
     acosh(double x);

DESCRIPTION
     The acosh() function computes the inverse hyperbolic cosine of the real
     argument x.

SPECIAL VALUES
     acosh(1) returns +0.

     acosh(x) returns a NAN and raises the "invalid" floating-point exception
     for x < 1.

     acosh(+infinity) returns +infinity.

SEE ALSO
     asinh(3), atanh(3), exp(3), infnan(3), math(3), matherr(3)

STANDARDS
     The acosh() function conforms to ISO/IEC 9899:1999(E).

HISTORY
     The acosh() function appeared in 4.3BSD.

4.3 Berkeley Distribution      November 15, 2002     4.3 Berkeley Distribution
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