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In ∆ABC Prve that (b) partr1.r2 + r2.r3 + r3.r1 = s^2
As we knowr = /sr1 = /s-ar2 = /s-br3= /s-cPut these value in LHSWe get^2[1/(s-b)*(s-a) +1/(s-b)(s-c) +1/ (s-c)(s-a)]Solve thia and you will get s2
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