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RE: Trigonometry Identity: Proof that sin^2(x) + cos^2(x) = 1
- HIVE video notes: https://peakd.com/hive-128780/@mes/trigonometry-identity-proof-that-sin2x-cos2x-1
- Trigonometry playlist: https://www.youtube.com/playlist?list=PL5EA2C23DE654B0DB
- MES Links: https://mes.fm/links