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Let ABC be an isosceles triangle with ba...

Let ABC be an isosceles triangle with base BC. If r is the radius of the circle inscribsed in `DeltaABC and r_(1)` is the radius of the circle ecribed opposite to the angle A, then the product `r_(1) r` can be equal to (where R is the radius of the circumcircle of `DeltaABC`)

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