Convert the following products into sum or difference. If angles are given in degrees, evaluate from tables 2 cos 5 theta cos 3 theta?

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Solution

$2 \cos 5 θ . \cos 3 θ = \cos (5 θ + 3 θ) + \cos (5 θ - 3 θ) = \cos 8 θ + \cos 2 θ$

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