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Geometry Level 3

Let \(A,B\) and \(C\) denote the interior angles of a non-degenerate triangle, then what is the least value of \[{ \sin }^{ 2 }\dfrac { A }{ 2 } +{ \sin }^{ 2 }\dfrac { B }{ 2 } +{ \sin }^{ 2 }\dfrac { C }{ 2 }?\]

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