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January 30, 2015

January 30, 2015

Posted by **Gaile** on Sunday, November 6, 2011 at 7:26pm.

cos37cos99 as a sum

Review question. I know the formula. Having trouble with working it out.

- trig -
**Steve**, Monday, November 7, 2011 at 11:31amcos A cos B = ½(cos(A−B) + cos(A+B))

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