soluzione
Scomporre
2x
8
y - 2x
2
y =
= 2x
2
y(x
6
- 1) =
= 2x
2
y(x
3
- 1)(x
3
+ 1) =
= 2x
2
y(x - 1)(x + 1)(x
2
+ x + 1)(x
2
- x + 1)