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If cot θ = (√m + √n)/(√m - √n), then (m + n) cos 2θ is equal to

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If cot θ = (√m + √n)/(√m - √n), then (m + n) cos 2θ is equal to

(A)  2√mn

(B)  (m + n)/(m - n)

(C)  (√m + √n)2

(D)  None of these

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Correct option (A)  2√mn

Given tan θ = √m - √n/√m + √n. so

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