In a triangle, if the angles A , B ,a n ...

In a triangle, if the angles `A , B ,a n dC` are in A.P. show that `2cos1/2(A-C)=(a+c)/(sqrt(a^2-a c+c^2))`

A

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

B

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

C

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

D

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

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The correct Answer is:

C

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