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6. Prove the following identities: a. Cos120 = 8sin (30) -8sin(30) +1 (3) b. Sin(x - x)Cos(n + x) Tan(2x - x) = Sin*x -

6. Prove the following identities: a. Cos120 = 8sin (30) -8sin(30) +1 (3) b. Sin(x - x)Cos(n + x) Tan(2x - x) = Sin*x - Sin x 3 7 (3) Sec(~ + x)Csc( 7 - x)Cot(-~+ x) 2 c. Tan2A = CotA - TanA (3)

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