The sum of all solutions of the equation cos x. cos(pi/3 + x) . cos(pi/3 - x) = 1/4, x ∈ [0, 6pi]
The sum of all solutions of the equation cos x. cos(pi/3 + x) . cos(pi/3 - x) = 1/4, x ∈ [0, 6pi]
(1) 15pi
(2) 30pi
(3) 110pi/3
(4) None of these
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