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Factorise difference of two squares (#266)
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Factorise difference of two squares (#266)
Factorise
a
2
−
b
2
a^2 - b^2
a
2
−
b
2
as
(
a
−
b
)
(
a
+
b
)
(a-b)(a+b)
(
a
−
b
)
(
a
+
b
)
.
