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To answer questions 22 23 find the solution set of 2 cos2x in the interval 0 x 2T 2 or when a table or calculator

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To answer questions 22 23 find the solution set of 2 cos2x in the interval 0 x 2T 2 or when a table or calculator is used in the interval 0 x 360 22 What is the second from the last step a cos x 1 2 b cos x 1 1 C cos x 2 d cos x 1

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