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ATANH(3)                    BSD Programmer's Manual                   ATANH(3)

N\bNA\bAM\bME\bE
    a\bat\bta\ban\bnh\bh - inverse hyperbolic tangent function

S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS
    #\b#i\bin\bnc\bcl\blu\bud\bde\be <\b<m\bma\bat\bth\bh.\b.h\bh>\b>

    _\bd_\bo_\bu_\bb_\bl_\be
    a\bat\bta\ban\bnh\bh(_\bd_\bo_\bu_\bb_\bl_\be _\bx);

D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN
    The a\bat\bta\ban\bnh\bh() function computes the inverse hyperbolic tangent of the real
    argument _\bx. For a discussion of error due to roundoff, see math(3).

R\bRE\bET\bTU\bUR\bRN\bN V\bVA\bAL\bLU\bUE\bES\bS
    The a\bat\bta\ban\bnh\bh() function returns the inverse hyperbolic tangent of _\bx if suc-
    cessful.  On the VAX and Tahoe, if the argument has absolute value bigger
    than or equal to 1, a\bat\bta\ban\bnh\bh() sets the global variable _\be_\br_\br_\bn_\bo to EDOM and a
    reserved operand fault is generated.

S\bSE\bEE\bE A\bAL\bLS\bSO\bO
    acosh(3),  asinh(3),  exp(3),  infnan(3) math(3),

H\bHI\bIS\bST\bTO\bOR\bRY\bY
    The a\bat\bta\ban\bnh\bh() function appeared in 4.3BSD.

4.3 Berkeley Distribution        June 4, 1993                                1