Trigonometry 1

Geometry Level 5

In a triangle \(ABC\) , \(\cos { A } .\cos { B } +\sin { A } .\sin { B } .\sin ^{ 2 }{ C } =1\) and \(a\), \(b\), \(c\) are lengths of sides . Find the value of \(\frac { r }{ R } \)

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