Sum and Difference Identities for Sine and Cosine, More Examples #3

patrickJMT
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Published on Jan 3, 2011

I SAY COS(X) IS NEGATIVE IN Q4, BUT IT SHOULD BE POSITIVE! SORRY FOR THE CONFUSION!
Sum and Difference Identities for Sine and Cosine, More Examples #3. More examples of using the sum and difference identities to find value other trig values. For more free math videos, visit http://PatrickJMT.com

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