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" 17.Prove that "r(1)+r(2)+r(3)-r=4R...

" 17.Prove that "r_(1)+r_(2)+r_(3)-r=4R

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Show that r_(1)+r_(2)+r_(3)-r=4R

Prove that r+r_(1)+r_(2)-r_(3)=4RcosC

Prove that r_(1) r_(2) + r_(2) r_(3) + r_(3) r_(1) = (1)/(4) (a + b + c)^(2)

Prove that r_(1) r_(2) + r_(2) r_(3) + r_(3) r_(1) = (1)/(4) (a + b + c)^(2)

Prove that r_(1) r_(2) + r_(2) r_(3) + r_(3) r_(1) = (1)/(4) (a + b + c)^(2)

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