$$3 { \left( \sqrt{ 5 \sqrt{ 7 \times 5 } } \right) }^{ 2 }$$
$15\sqrt{35}\approx 88.741196746$
$$3\left(\sqrt{5\sqrt{35}}\right)^{2}$$
$$3\times 5\sqrt{35}$$
$$15\sqrt{35}$$
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