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" 3.Show that "(r(1))/(bc)+(r(2))/(ca)+(...

" 3.Show that "(r_(1))/(bc)+(r_(2))/(ca)+(r_(3))/(ab)=(1)/(r)(1)/(2R)

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Show that (r_(1))/(bc)+(r_(2))/(ca)+(r_(3))/(ba)=(1)/(r)-(1)/(2R)

In DeltaABC" prove that " (r_(1))/(bc)+(r_(2))/(ca)+(r_(3))/(ab)=(1)/(r)-(1)/(2R)

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In Delta ABC with usual notation (r_(1))/(bc)+(r_(2))/(ca)+(r_(3))/(ab) is

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