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I've been teaching high school math for over 25 years. I write about my experiences here and also share activities that I have done with my classes that have been successful (and some that have been not so successful).
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Proof of the Sum and Difference Trig Identities

Here's a way to generate the sum and difference identities for sine and cosine! Fun fact: I sped up the video so my voice sounds higher than it is in real life. 😀 You may be interested in my Sum and Difference Identities Circuit . Disclosure: Some of the links below are affiliate links. This means that, at zero…