If 2 cos 3θ = 1 then θ = ?

Foundation

Mathematics Foundation

Introduction to Trigonometry

Question

10º

15º

30º

20º

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$2 \cos 3 θ = 1 \Rightarrow \cos 3 θ = \frac{1}{2} = \cos 60 º \Rightarrow 3 θ = 60 º \Rightarrow θ = 20 º$

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