[LAD] Calculate R M S - correction

[Fons Adriaensen]

On Fri, Feb 18, 2011 at 07:02:54PM +0000, Fons Adriaensen wrote:

> Now the square of sin(x) is  0.5 + 0.5 * cos(2 * x)

should be 0.5 - 0.5 * cos(2 * x) 

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FA