Evaluate
\sqrt{6}\approx 2.449489743
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\sqrt{6.25-0.5^{2}}
Calculate 2.5 to the power of 2 and get 6.25.
\sqrt{6.25-0.25}
Calculate 0.5 to the power of 2 and get 0.25.
\sqrt{6}
Subtract 0.25 from 6.25 to get 6.
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