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

Thanks to all of you who support me on Patreon. You da real mvps! $1 per month helps!! 🙂 https://www.patreon.com/patrickjmt !! 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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