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March 27, 2015

March 27, 2015

Posted by **Rick** on Thursday, March 5, 2009 at 10:49pm.

sin (7pi/6 -x) + cos (2pi +x)

- trig -
**drwls**, Thursday, March 5, 2009 at 11:33pmUse the formulas for sin (A - B) and cos (A + B)

I can tell you right away that cos (2 pi + x) = cos x

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