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Find the exact value of cos (7?/12)a) 1-?3/2?2b) ?3+1/?2c) ?3-1/2?2d) ?3+1/2?2

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Find the exact value of cos (7?/12)a) 1-?3/2?2b) ?3+1/?2c) ?3-1/2?2d) ?3+1/2?2

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Find the exact value of cos (7?/12)a) 1-?3/2?2b) ?3+1/?2c) ?3-1/2?2d) ?3+1/2?2

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