Simplify: (3x²+2xy-2y²)(x+y)-(x²-xy+y²)(x-y)
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Answer:
x 3
y 3
=
x(x
2
−
xy+
(x+ y)(x
2
− xy+
y 2
y 2
y(x
2
−
xy+
y 2
=
x 3
x 2
xy
2
+
−
2
x 2
y 3
=
x 3
y 3
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