On Thu, 25 May 2006, Robert Kern apparently wrote:
The method you showed of using % (2*pi) is only accurate when the values are created by multiplying the same pi by another value. Otherwise, it just introduces another source of error, I think.
Just to be clear, I meant not (!) to presumptuosly propose a method for improving thigs, but just to illustrate the issue: both the loss of accuracy, and the obvious conceptual point that there is (in an abstract sense, at least) no need for sin(x) and sin(x+ 2*pi) to differ.