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FreeBSD 11.0 - man page for asinh (freebsd section 3)

ASINH(3)						   BSD Library Functions Manual 						  ASINH(3)

NAME
asinh, asinhf, asinhl -- inverse hyperbolic sine functions
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h> double asinh(double x); float asinhf(float x); long double asinhl(long double x);
DESCRIPTION
The asinh(), asinhf(), and asinhl() functions compute the inverse hyperbolic sine of the real argument x. For a discussion of error due to roundoff, see math(3).
RETURN VALUES
These functions return the inverse hyperbolic sine of x.
SEE ALSO
acosh(3), atanh(3), exp(3), math(3)
HISTORY
The asinh(), asinhf(), and asinhl() functions appeared in 4.3BSD, FreeBSD 2.0, and FreeBSD 10.0, respectively.
BSD
June 9, 2013 BSD