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In DeltaABC, with usual notations, if a,...

In `DeltaABC`, with usual notations, if a,b,c are in AP then `acos^(2)((C)/(2))+cos^(2)((A)/(2))=`

A

`(3a)/(2)`

B

`(3c )/(2)`

C

`(3b)/(2)`

D

`(3abc)/(2)`

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The correct Answer is:
C
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