ρ
2
1
−
ρ
2
2
=
(
ρ
1
−
ρ
2
)
(
ρ
1
+
ρ
2
)
=
2
x
d
ρ
1
2
−
ρ
2
2
=
(
ρ
1
−
ρ
2
)
(
ρ
1
+
ρ
2
)
=
2
x
d
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