$${ \left( \frac{ 1 }{ 2 } \times -1 \right) }^{ 2 }$$
$\frac{1}{4}=0.25$
$$\left(-\frac{1}{2}\right)^{2}$$
$$\frac{1}{4}$$
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$\frac{1}{2 ^ {2}} = 0.25$
