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January 25, 2015

January 25, 2015

Posted by **rob** on Thursday, March 3, 2011 at 12:30am.

- trigonometry -
**agrin04**, Thursday, March 3, 2011 at 5:28amcos ¤ = (4^2 + 5^2 - 6^2)/(2*4*5)

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