Evaluate
\frac{\sqrt{2}}{2}-1\approx -0.292893219
Factor
\frac{\sqrt{2} - 2}{2} = -0.2928932188134524
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\frac{1}{2}\sqrt{2}-1
Combine 2\sqrt{2} and -\frac{3\sqrt{2}}{2} to get \frac{1}{2}\sqrt{2}.
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