If - - 2 then cos - - -cos - - - is equal to

The correct option is B 13 Given, αβ=2 , then cos (α + β)cos (α β) = cosα·cosβ sinαsinβcosα·cosβ + sinα·sinβ = α·β 1α·β + 1 = 2 12 + 1 = 13 ...

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Cos(A+B)Cos(A-B)

If αβ = 2 t...

Question

If $cot α cot β = 2$ then $\frac{cos (α + β)}{cos (α - β)}$ is equal to

3

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\frac{2}{3}

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\frac{1}{3}

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tan α tan β

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