Evaluate
\frac{4\sqrt{5}}{5}\approx 1.788854382
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\frac{4\sqrt{5}}{\left(\sqrt{5}\right)^{2}}
Rationalize the denominator of \frac{4}{\sqrt{5}} by multiplying numerator and denominator by \sqrt{5}.
\frac{4\sqrt{5}}{5}
The square of \sqrt{5} is 5.
Examples
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