Sum and Difference Identities to Simplify an Expression, Example 3. In this video, I simply show how to simplify some expressions by using sum and difference identities. Nothing crazy, just showing how one must know identities to make things more manageable! For more free math videos, visit http://PatrickJMT.com
Tagged under: math,precalculus,sum,difference,identity,simplify,trigonometry,sine,cosine,tangent
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