The documentation's actually fairly clear on this: "The cosine of a 90 degree angle is zero, but because of the inherent inaccuracy of decimal calculations using binary numbers, Flash Player will report a number extremely close to, but not exactly equal to, zero."
Nevertheless, it seems... sloppy to me. Michael Krotscheck Senior Developer RESOURCE INTERACTIVE <http://www.resource.com/> www.resource.com <http://www.resource.com> 614 621 2888 main 614 410 3195 direct 412 726 8087 mobile [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> ________________________________ From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Troy Gilbert Sent: Sunday, September 16, 2007 5:15 PM To: flexcoders@yahoogroups.com Subject: Re: [flexcoders] Math.cos...? > Why does Math.cos(Math.PI/2) not return zero? Round-off error in the Math libs? It does return a value very close to 0 (1.7xe-17). Troy.
