The solution set of (5+4cosθ)(2cosθ+1)=0in the interval [0,2π] is [EAMCET 2003]

{π3,2π3}

{π3,π}

{2π3,4π3}

{2π3,5π3}

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Text solutionVerified

(5+4cosθ)(2cosθ+1)=0 cosθ=−5/4, which is not possible. ∴2cosθ+1=0 or cosθ=−1/2 Þ θ=2π3,4π3. Solution set is{2π3,4π3}∈[0,2π].

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Question Text	The solution set of (5+4cosθ)(2cosθ+1)=0in the interval [0,2π] is [EAMCET 2003]
Answer Type	Text solution:1
Upvotes	150