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Question

If cos3θ = αcosθ+βcos3θ, then (α,β) =


A

(3,4)

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B

(4,3)

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C

(-3,4)

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D

(3,-4)

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Solution

The correct option is C

(-3,4)


Given that cos3θ=αcosθ+βcos3θ

But cos3θ=4cos3θ3cosθ (α,β) = (-3, 4).


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