$$\sqrt{12}\times\sqrt{45}\times\sqrt{15}$$
$90$
$$\sqrt{12}\sqrt{15}\sqrt{3}\sqrt{15}$$
$$\sqrt{12}\times 15\sqrt{3}$$
$$\sqrt{3}\sqrt{4}\times 15\sqrt{3}$$
$$3\times 15\sqrt{4}$$
$$45\sqrt{4}$$
$$45\times 2$$
$$90$$
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$2\times 3^{2}\times 5$