Trigonometric EquationMedium
Question
If cos 2B =
, then -
, 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.
⇒
⇒ tanA tanC = tan2B
tanA, tanB, tanC are in G. P.
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