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In triangle ABC, if A+C=2B, then (a+c)/(...

In triangle ABC, if `A+C=2B`, then `(a+c)/(sqrt(a^(2)-ac+c^(2)))` is equal to

A

`2cos.(A-C)/(2)`

B

`sin.(A+C)/(2)`

C

`sin.(A)/(2)`

D

`sin.(2A+C)/(2)`

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A
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