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4. (4 marks) Find the exact value of each :1: E [0, 27?) for which cos2 (1:) = %sin(2a':) 4. (4 marks) Find the exact

4. (4 marks) Find the exact value of each :1: E [0, 27?) for which cos2 (1:) = %sin(2a':)

4. (4 marks) Find the exact value of each e [0, 2T) for which cos2@) = sin(2x).

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