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Man Pages
ACOSH(3) FreeBSD Library Functions Manual ACOSH(3)

acosh, acoshf, acoshl
inverse hyperbolic cosine functions

Math Library (libm, -lm)

#include <math.h>

double
acosh(double x);

float
acoshf(float x);

long double
acoshl(long double x);

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.

asinh(3), atanh(3), exp(3), fenv(3), math(3)

The acosh(), acoshf(), and acoshl() functions appeared in 4.3BSD, FreeBSD 2.0, and FreeBSD 10.0, respectively.
June 9, 2013 FreeBSD 13.1-RELEASE

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