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Show that (b-c)/(r (1))+ (c-a)/(r (2))+(...

Show that `(b-c)/(r _(1))+ (c-a)/(r _(2))+(a-b)/(r _(3)) =0.`

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In DeltaABC,(b-c)/r_1+(c-a)/r_2+(a-b)/r_3=