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7. (a) (3 points) Verify the identity tan r + cot I = 2 csc(21). (b) (4 points) Find all solutions to the equation secr

7. (a) (3 points) Verify the identity tan r + cot I = 2 csc(21). (b) (4 points) Find all solutions to the equation secr + tan r = 1. (c) (3 points) Using an appropriate sum formula, find the exact value of COS

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