Question

Pls answer this question fast... if someone knows then only answer otherwise leave...​

Answer 1

Answer:

Pur the formula for a^2 b^2

Answer 2

Step-by-step explanation:

$( \frac{1}{a} + \frac{1}{b}) \div ( \frac{1}{ {a}^{2} } - \frac{1}{ {b}^{2} }) \\ = > \frac{a + b}{ab} \div \frac{ {b}^{2} - {a}^{2} }{ {a}^{2} {b}^{2} } \\ = > \frac{a + b}{ab} \times \frac{ {a}^{2} {b}^{2} }{ {b}^{2} - {a}^{2} } \\ = > \frac{ab}{b - a}$

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