4.3BSD-Reno/share/man/cat3/atanh.0

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ASINH(3M)		      1986			ASINH(3M)



NNAAMMEE
     asinh, acosh, atanh - inverse hyperbolic functions

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<mmaatthh..hh>>

     ddoouubbllee aassiinnhh((xx))
     ddoouubbllee xx;;

     ddoouubbllee aaccoosshh((xx))
     ddoouubbllee xx;;

     ddoouubbllee aattaannhh((xx))
     ddoouubbllee xx;;

DDEESSCCRRIIPPTTIIOONN
     These functions compute the designated inverse hyperbolic
     functions for real arguments.

EERRRROORR ((dduuee ttoo RRoouunnddooffff eettcc..))
     These functions inherit much of their error from log1p
     described in exp(3M).  On a VAX, acosh is accurate to about
     3 _u_l_ps, asinh and atanh to about 2 _u_l_ps.  An _u_l_p is one _Unit
     in the _Last _Place carried.

DDIIAAGGNNOOSSTTIICCSS
     Acosh returns the reserved operand on a VAX if the argument
     is less than 1.

     Atanh returns the reserved operand on a VAX if the argument
     has absolute value bigger than or equal to 1.

SSEEEE AALLSSOO
     math(3M), exp(3M), infnan(3M)

AAUUTTHHOORR
     W. Kahan, Kwok-Choi Ng


















Printed 7/27/90                May				1