# 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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