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Corrections for double angle identity
1. cos^2{a}-sin^2{a} by pahio on 2007-05-14 10:30:15 (accepted)
2. cos^2{a}-sin^2{a} by pahio on 2007-05-14 10:27:57 (retracted)
3. add a link please by jac on 2005-02-28 01:21:25 (accepted)
4. double angle identity by pahio on 2004-05-04 15:59:03 (accepted)
5. missing one for cosine by drini on 2002-07-15 22:25:25 (accepted)

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