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In any A B C , prove that r^2+r1 2+r2 2...

In any ` A B C ,` prove that `r^2+r1 2+r2 2+r3 2=16 R^2-a^2-b^2-c^2dot`

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  3. In any A B C , prove that r^2+r1 2+r2 2+r3 2=16 R^2-a^2-b^2-c^2dot

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