Question
Factorise:
$a^3-\frac{1}{a^3}-2 a+\frac{2}{a}$
$a^3-\frac{1}{a^3}-2 a+\frac{2}{a}$
✓
Answer
$\left(a-\frac{1}{a}\right)\left(a^2+\frac{1}{a^2}-1\right)$
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