Why does sq(12) / 12 become sq(3) / 6 ?
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$\displaystyle \frac{\sqrt{12}}{12} $ $\displaystyle = \frac{\sqrt{4 \times 3}}{2 \times 6} $ $\displaystyle = \frac{\sqrt{4}\times\sqrt{3}}{2 \times 6}$ $\displaystyle = \frac{2\sqrt{3}}{2\times 6} $ $\displaystyle = \frac{\sqrt{3}}{6}$
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