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   ocr: Prove: - I 26sc?A + cosA 1-COSA Steps - I 1 (1) 1+0 - cOSA -COSA -COSA 1 1+cosA (2) 1+cosA - COSA 1-CoSA 1+cosA 1-csA+1+0sA (3) (1+0 COSA)(1 - COSA) 2 (4) I 1-C0S2A 2 (5) sin2A (6) 20s02A Proving Identities-Guideline 4