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ATANH(3) Library Functions Manual ATANH(3) NAME atanh, atanhf, atanhl - inverse hyperbolic tangent function LIBRARY Math Library (libm, -lm) SYNOPSIS #include <math.h> double atanh(double x); float atanhf(float x); long double atanhl(long double x); DESCRIPTION The atanh(), atanhf(), and atanhl() functions compute the inverse hyperbolic tangent of the real argument x. RETURN VALUES If |x|>=1, atanh(x), atanhf(x), and atanhl(x) return +inf, -inf or NaN, and sets the global variable errno to EDOM. SEE ALSO acosh(3), asinh(3), exp(3), math(3) STANDARDS The atanh() function conforms to ISO/IEC 9899:1999 ("ISO C99"). HISTORY The atanh() function appeared in 4.3BSD. NetBSD 10.99 January 29, 2013 NetBSD 10.99