Main index | Section 3 | 日本語 | 한국인 | Deutsch | Options |

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 |

Main index | Section 3 | 日本語 | 한국인 | Deutsch | Options |

Please direct any comments about this manual page service to Ben Bullock.

“ | Today, the Unix equivalent of a power drill would have 20 dials and switches, come with a nonstandard plug, require the user to hand-wind the motor coil, and not accept 3/8" or 7/8" drill bits (though this would be documented in the BUGS section of its instruction manual). | ” |

— The Unix Haters' handbook |