$\frac{1}{{¯ | r |}^{2}}$ is equals to

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Solution

$= \frac{1}{| {r |}^{- 2}}$
Move $| {r |}^{- 2}$ to the numerator using the negative exponent rule $\frac{1}{| {b |}^{- n}} = | {b |}^{n}$ ,
so the $\frac{1}{| {r |}^{- 2}} = {| r |}^{2}$

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