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(freebsd section 3)
man page for acoshl

ACOSH(3)						   BSD Library Functions Manual 						  ACOSH(3)

NAME
acosh, acoshf, acoshl -- inverse hyperbolic cosine functions LIBRARY
Math Library (libm, -lm) SYNOPSIS
#include <math.h> double acosh(double x); float acoshf(float x); long double acoshl(long double x); DESCRIPTION
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). RETURN VALUES
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. SEE ALSO
asinh(3), atanh(3), exp(3), fenv(3), math(3) HISTORY
The acosh(), acoshf(), and acoshl() functions appeared in 4.3BSD, FreeBSD 2.0, and FreeBSD 10.0, respectively. BSD
June 9, 2013 BSD

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