Addedum, I Challenged Myself to Present--AKA If I can do it, so can you!

BTW: If you like Make and Takes, or need an awesome activity for Pre-Calc/Trig, I presented this "My Favorite," (#TMC15) a foldable for finding the formula for the Sum of Angles for Sine and Cosine that SHOWS why cos (x + y) ends up being subraction!

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