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Math Library (libm, -lm)

#include <math.h>

The
`acosh()`,
`acoshf()`,
and
`acoshl()`
functions compute the inverse hyperbolic cosine
of the real
argument
*x*.
For a discussion of error due to roundoff, see
math(3).

These functions
return the inverse hyperbolic cosine of
*x*.
If the argument is less than 1,
`acosh()`
raises an invalid exception and returns an NaN.

The
`acosh()`,
`acoshf()`,
and
`acoshl()`
functions appeared in
*BSD 4.3,*
FreeBSD 2.0,
and
FreeBSD 10.0,
respectively.

ACOSH (3) | June 9, 2013 |

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