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The number of solutions of the equation cos(x + π/3) cos(π/3 - x) - 1/4 cos^2 2x, x ∈ [-3π, 3π] is:

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The number of solutions of the equation cos(x + π/3) cos(π/3 - x) - 1/4 cos2 2x, x ∈ [-3π, 3π] is: 

(A) 8 

(B) 5 

(C) 6 

(D) 7

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Correct option is (D) 7

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