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In a triangle A B C ,\ (r1-r)(r2-r)(r3-r...

In a triangle `A B C ,\ (r_1-r)(r_2-r)(r_3-r)` is equal to `4R r^2` (b) `(4a b cdot)/((a+b+c)^2)` `16 R^3(cos A+cos B+cos C-1)` `r^3cose c A/2cose c B/2cose c C/2`

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