acosh man page on YellowDog

acosh man page on YellowDog

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ACOSH(3)		   Linux Programmer's Manual		      ACOSH(3)

NAME
       acosh, acoshf, acoshl - inverse hyperbolic cosine function

SYNOPSIS
       #include <math.h>

       double acosh(double x);
       float acoshf(float x);
       long double acoshl(long double x);

       Link with -lm.

DESCRIPTION
       The  acosh()  function  calculates  the inverse hyperbolic cosine of x;
       that is the value whose hyperbolic cosine is x.	If x is less than 1.0,
       acosh() returns not-a-number (NaN) and errno is set.

ERRORS
       EDOM   x is out of range.

CONFORMING TO
       SVr4,  POSIX.1-2001,  4.3BSD,  C89.  The float and long double variants
       are C99 requirements.

SEE ALSO
       asinh(3), atanh(3), cacosh(3), cosh(3), sinh(3), tanh(3)

				  2002-07-25			      ACOSH(3)

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