In any - ABC- if cot A-2- cot B-2- cot C-2 are in A-P- then a- b- c are in

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Trigonometric Ratios for Sum of Two Angles

In any Δ AB...

Question

In any $Δ A B C$ , if cot $\frac{A}{2}$ , cot $\frac{B}{2}$ , cot $\frac{C}{2}$ are in A,P., then a, b, c are in

A.P.

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G.P.

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H.P.

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none of these

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