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Problem
Problem
Show that
(
r
1
+
r
2
)
(
r
2
+
r
3
)
(
r
3
+
r
1
)
=
4
R
s
2
(r_1 + r_2)(r_2 + r_3)(r_3 + r_1) = 4Rs^2
(
r
1
+
r
2
)
(
r
2
+
r
3
)
(
r
3
+
r
1
)
=
4
R
s
2
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