In triangle ABC, I is the incentre of th...

In triangle `ABC, I` is the incentre of the triangle.If 'R' and 'r' be the circum-radius and in-radius, then `(AI)(BI)(CI)` is equal to:
`1) 4r^(2)R`
`2) 4R^(2)r `
`3) r^(2)R`
`4) R^(2)r`

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