Evaluate
\frac{1}{6}-\sqrt{2}\approx -1.247546896
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\frac{1-6\sqrt{2}}{6}
Factor 72=6^{2}\times 2. Rewrite the square root of the product \sqrt{6^{2}\times 2} as the product of square roots \sqrt{6^{2}}\sqrt{2}. Take the square root of 6^{2}.
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