$${ 5 }^{ 2 } - \sqrt{ 8-(4-6)-12 }$$
$\text{Indeterminate}$
$$25-\sqrt{8-\left(4-6\right)-12}$$
$$25-\sqrt{8-\left(-2\right)-12}$$
$$25-\sqrt{8+2-12}$$
$$25-\sqrt{10-12}$$
$$25-\sqrt{-2}$$
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