Trigonometric EquationHard

Question

If cos 2B = , then -

Options

A.tan A, tan B, tan C are in A. P.

B.tan A, tan B, tan C are in G. P.

C.tan A, tan B, tan C are in H.P.

D.None of these

Solution

⇒
⇒
⇒   tanA tanC = tan²B
    tanA, tanB, tanC are in G. P.

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