Question:
Factorize each of the following expression:
$a^{4}-\frac{1}{b^{4}}$
Solution:
$a^{4}-1 / b^{4}$
= (a2)2 - 1/(b2)2
= a2- 1/b2a2 + 1/b2
= a - 1/ba + 1/ba2 + 1/b2
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