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Mathematics
Mathematics
Problem
Factorise:
a
b
(
x
2
+
y
2
)
+
x
y
(
a
2
+
b
2
)
ab(x^2 + y^2) + xy(a^2 + b^2)
ab
(
x
2
+
y
2
)
+
x
y
(
a
2
+
b
2
)
.
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