Simplify: (a^ -1 +b^ -1 ) (a^ -2 -b^ -2 ) - Vidyadip

Question

Simplify:
$\left(a^{-1}+b^{-1}\right) \div\left(a^{-2}-b^{-2}\right)$

✓

Answer

$\frac{a b}{(b-a)}$

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