1ACOSH(3)                   Linux Programmer's Manual                  ACOSH(3)
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NAME

6       acosh, acoshf, acoshl - inverse hyperbolic cosine function
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SYNOPSIS

9       #include <math.h>
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11       double acosh(double x);
12       float acoshf(float x);
13       long double acoshl(long double x);
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15       Link with -lm.
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DESCRIPTION

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

23       EDOM   x is out of range.
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CONFORMING TO

26       SVr4,  POSIX.1-2001,  4.3BSD,  C89.  The float and long double variants
27       are C99 requirements.
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SEE ALSO

30       asinh(3), atanh(3), cacosh(3), cosh(3), sinh(3), tanh(3)
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34                                  2002-07-25                          ACOSH(3)
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