February 19, 2017

Homework Help: Trigonometry

Posted by Tommy on Monday, July 21, 2008 at 7:07am.

How to memorize the sum-to-product and product-to-sum formulae more easily ??
I know how to deduce the formula but when i try to memorize it, its so hard. Always sin, cos, a+b, a-b, i always get confused. Is there any way to memorize more efficiently??

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