# 3sqrt(1/84)

$$\displaystyle{3}\sqrt{{\frac{{1}}{{84}}}}$$

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2abehn

$$3\sqrt{\frac{1}{84}}$$

$$=3\sqrt{\frac{1^{3}}{4^{3}}}$$

$$=3\sqrt{\frac{1}{4}}^{3}$$

$$=\frac{1}{4}$$