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The solution(s) to the following equation is (are): 2cos2 x - cos x - 1 = 0 for O s x $ 27T ( a)

The solution(s) to the following equation is (are): 2cos2 x - cos x - 1 = 0 for O s x $ 27T ( a) 0 and 27T O b ) 271 47T 3 and 3 O c o, IT 2 TT 3' 3 2 71 O d) o, 271 471 2 7T 3 ' 3

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