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Problem
Show that
r
1
b
c
+
r
2
c
a
+
r
3
a
b
=
2
R
−
r
\frac{r_1}{bc} + \frac{r_2}{ca} + \frac{r_3}{ab} = 2R - r
b
c
r
1
+
c
a
r
2
+
ab
r
3
=
2
R
−
r
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