a
2
−
b
=
(
+
)
, donde
x
y
3
.
9
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a
2
−
b
2
=
(
a
+
b
)
(
a
−
b
)
, donde
a
=
x
y
b
=
3
.
9
(
x
+
3
)
(
x
−
3
)