In `DeltaABC` if the angle A, B, C are in A.P. then `(a+c)/sqrt(a^2-ac – InterviewSolution

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1.	In `DeltaABC` if the angle A, B, C are in A.P. then `(a+c)/sqrt(a^2-ac+c^2)=`A. `2cos((A-C)/(2))`B. `sin((A+C)/(2)`C. `sin(A)/(2)`D. `sin((C)/(2))`
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