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If in Delta ABC, tan.(A)/(2) = (5)/(6) =...

If in `Delta ABC, tan.(A)/(2) = (5)/(6) = (2)/(5)`, then prove that a, b, and c are in A.P.

A

a,c,b are in AP

B

a,b,c are in AP

C

b,a,c are in AP

D

a,b,c are in GP

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The correct Answer is:
B
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