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Show that r+r(3)+r(1)-r(2)=4RcosB....

Show that `r+r_(3)+r_(1)-r_(2)=4RcosB.`

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" (i) Show that "r+r_(1)+r_(2)-r_(3)=4R cos C

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

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