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In Delta ABC, if a cos^2""C/2+c cos^2""A...

In `Delta ABC, if a cos^2""C/2+c cos^2""A/2=(3b)/2` then a,b,c are in

A

2b = a + c

B

`b^(2)=ac`

C

`1/b=1/a+1/c`

D

a = c

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