Re: [Math] sin(), cos() not working? What special magic must I use to summon their powers?
# Re: [Math] sin(), cos() not working? What special magic must I use to summon their powers?

**Subject**: **Re: [Math] sin(), cos() not working? What special magic must I use to summon their powers?**
- From: Andrew Farmer <email@hidden>
- Date: Tue, 30 Sep 2008 17:09:36 -0700

`On 30 Sep 08, at 16:43, Michael Robinson wrote:
`retVal = lround(size*(1-cos(asin((double)i/(double)size))));
if(retVal > 0 ) return retVal;

Note that cos(asin(x)) = sqrt(1-x*x).

HTH.
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