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In Delta ABC, sec A, sec B, sec C are i...

In `Delta ABC, sec A, sec B, sec C` are in harmonic progression, then

A

a,b,c are in harmonic progression

B

`cot ""A/2, cot ""B/2, cot ""C/2` are in harminoc progression

C

`r _(1),r_(2),r_(3)` are in arithmetic progression

D

`cot ""A/2, cot ""B/2 , cot ""C/2` are in antimetic progresson

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The correct Answer is:
C, D
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