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Prove the following identities. 1. cosA(secA - cosA) = sin2A 2. tan?A + 4 = sec2A + 3 secA 3. sinA = cotA sinA COSA

Prove the following identities. 1. cosA(secA - cosA) = sin2A 2. tan?A + 4 = sec2A + 3 secA 3. sinA = cotA sinA COSA 1 4. = CSC A - CSCA cotA 1 +cosA 1 -3cosA -4cos2 A 1 - 4cosA 5. = sin2 A 1 - COSA

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