Trigonometry 1

Geometry Level 5

In a triangle ABCABC , cosA.cosB+sinA.sinB.sin2C=1\cos { A } .\cos { B } +\sin { A } .\sin { B } .\sin ^{ 2 }{ C } =1 and aa, bb, cc are lengths of sides . Find the value of rR\frac { r }{ R }

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