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If 3 cosx = 2 cos(x − 2y), then tan(x – y) tany is equal to

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If 3 cosx = 2 cos(x − 2y), then tan(x – y) tany is equal to

(A)   5

(B)   6

(C)  1/5

(D)   1/6

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Correct option (C)  1/5

Given cos(x - 2y)/cos x = 3/2

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