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September 20, 2014

September 20, 2014

Posted by **paula** on Saturday, January 23, 2010 at 8:51pm.

- trig -
**drwls**, Saturday, January 23, 2010 at 8:55pmIs that supposed to be cos^2(120) of cos(2*120) ?

The cosine of 120 is -cos 60 = -1/2.

That may help.

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