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In any Delta ABC, ((b-c)/(a))cos^(2)((A)...

In any `Delta ABC, ((b-c)/(a))cos^(2)((A)/(2))+((c-a)/(b))cos ^(2)((b )/(2))+((a-b)/(2 ))cos ^(2)((C)/(2))` is equal

A

`0`

B

`(s-a)(s-b)`

C

`(s-b)(s-c)`

D

`(s-c)(s-a)`

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The correct Answer is:
A
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