1ASINH(3M)                                                            ASINH(3M)
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NAME

6       asinh, acosh, atanh - inverse hyperbolic functions
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SYNOPSIS

9       #include <math.h>
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11       double asinh(x)
12       double x;
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14       double acosh(x)
15       double x;
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17       double atanh(x)
18       double x;
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DESCRIPTION

21       These functions compute the designated inverse hyperbolic functions for
22       real arguments.
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ERROR (due to Roundoff etc.)

25       These functions inherit much of their error  from  log1p  described  in
26       exp(3M).   On a VAX, acosh is accurate to about 3 ulps, asinh and atanh
27       to about 2 ulps.  An ulp is one Unit in the Last Place carried.
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DIAGNOSTICS

30       Acosh returns the reserved operand on a VAX if  the  argument  is  less
31       than 1.
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33       Atanh  returns  the reserved operand on a VAX if the argument has abso‐
34       lute value bigger than or equal to 1.
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SEE ALSO

37       math(3M), exp(3M), infnan(3M)
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AUTHOR

40       W. Kahan, Kwok-Choi Ng
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444.3 Berkeley Distribution        May 12, 1986                        ASINH(3M)
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