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If cos 2B=(cos (A+C))/(cos(A-C)) , then...

If ` cos 2B=(cos (A+C))/(cos(A-C))` , then tan A , tan B , tan C are in

A

A.P.

B

H.P.

C

G.P.

D

A.G.P

Text Solution

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The correct Answer is:
C
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