MathematicsEasy7×since 2019Q5632Let ∣cosθcos(60−θ)cos(60+θ)∣≤18,θϵ[0,2π]|\cos \theta \cos (60-\theta) \cos (60+\theta)| \leq \frac{1}{8}, \theta \epsilon[0,2 \pi]∣cosθcos(60−θ)cos(60+θ)∣≤81,θϵ[0,2π]. Then, the sum of all θ∈[0,2π]\theta \in[0,2 \pi]θ∈[0,2π], where cos3θ\cos 3 \thetacos3θ attains its maximum value, is :A6π6 \pi6πB9π9 \pi9πC18π18 \pi18πD15π15 \pi15πCheck answerSkip