$$[ ( \frac { 5 } { 2 } ) ^ { 4 } ] ^ { - 2 }$$
$\frac{256}{390625}=0.00065536$
$$\left(\left(\frac{5}{2}\right)^{4}\right)^{-2}$$
$$\left(\frac{5}{2}\right)^{4\left(-2\right)}$$
$$\left(\frac{5}{2}\right)^{-8}$$
$$\frac{256}{390625}$$
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$\frac{2 ^ {8}}{5 ^ {8}} = 0.00065536$
