Martin D Kealey wrote:
> On Thu, 26 Feb 2009, Jon Lang wrote:
>> asin is not the inverse function of sin, although it's probably as close
>> as you can get.  And even there, some sort of compiler optimization could
>> potentially be done, replacing the composition of asin and sin (both of
>> which have the potential to intensify error) with a normalization of the
>> value into the -pi ..^ pi range (which might also introduce error).
> Hmmm ... the normal mathematical range of arc-sine is (-π,+π], rather than
> [-π,+π), especially where complex numbers are concerned: arg(-1) == +π.
> (Well, so much for consistently using lower half-open ranges.)'re right.  Sorry; my error.

Jonathan "Dataweaver" Lang

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