Angles of triangle in AP

Geometry Level pending

If the angles \(A,B,C\) of the triangle \(ABC \) are in an arithmetic progression. and \(a,b,c\) represent the length of sides opposite to angles \(A, B\) and \(C\) respectively, then the value of

\(\dfrac { a+c }{ \sqrt { { (a }^{ 2 }-ac+{ c }^{ 2 }) } } \) is

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