NAME atanh, atanhf - inverse hyperbolic tangent functions CONTENTS Library Synopsis Description Return Values See Also History LIBRARY .Lb libm SYNOPSIS .In math.h double atanh "double x" float atanhf "float x" DESCRIPTION The atanh and the atanhf functions compute the inverse hyperbolic tangent of the real argument x. For a discussion of error due to roundoff, see math(3). RETURN VALUES The atanh and the atanhf functions return the inverse hyperbolic tangent of x if successful. If the argument has absolute value 1, a divide-by-zero exception is raised and an infinity is returned. If |x| > 1, an invalid exception is raised and an NaN is returned. SEE ALSO acosh(3), asinh(3), exp(3), fenv(3), math(3) HISTORY
