The Most Obvious Thing you Never Noticed about Pythagoras

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cos(3°): https://youtu.be/278PtWdir3E
sin(1°): https://youtu.be/cWBroMOwLFo
The other Trig Video: https://youtu.be/9kvt90KGpcQ
Complex Numbers, but Different: https://www.youtube.com/watch?v=BPK5Dkuw5Mw&list=PLN2B6ZNu6xmcg3R4wfUlIxtfgtr-2GYAm

Today we prove the Fundamental Theorem of Trigonometry, aka the Pythagorean identity in the most obvious, but elegant way possible using the addition formula for the cosine. It's that easy, seriously lol Enjoy! :D

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