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May 27, 2016
Posted by **Fabian onyango ndege** on Thursday, February 21, 2013 at 4:04pm.

- trig -
**Steve**, Thursday, February 21, 2013 at 5:48pmuse your product-to-sum formulas:

sinAcosB = 1/2 (sin(A+B) + sin(A-B))

sin4x cos3x = 1/2 (sin7x + sin(x))