JEE Main 20249 Apr, Morning shiftMathematicsEasyTrigonometry118× since 2002Let ∣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 :AOption A. 6π6 \pi6πBOption B. 9π9 \pi9πCOption C. 18π18 \pi18πDOption D. 15π15 \pi15πCheckSkip · show solution
