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RE: Trigonometry Identities: cos(x +/- y) = cos(x)cos(y) -/+ sin(x)sin(y)

in DTube • 3 years ago

I don't always prove the cosine addition and subtraction identities but when I do I usually use both the law of cosines and the Pythagorean theorem in the proof ;)

View video notes on the Hive blockchain: https://peakd.com/hive-128780/@mes/trigonometry-identities-cosine-addition-subtraction

3 years ago in DTube by
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