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\frac{\sqrt{15}}{2\sqrt{5}}
Cancel out 1 in both numerator and denominator.
\frac{\sqrt{15}\sqrt{5}}{2\left(\sqrt{5}\right)^{2}}
Rationalize the denominator of \frac{\sqrt{15}}{2\sqrt{5}} by multiplying numerator and denominator by \sqrt{5}.
\frac{\sqrt{15}\sqrt{5}}{2\times 5}
The square of \sqrt{5} is 5.
\frac{\sqrt{5}\sqrt{3}\sqrt{5}}{2\times 5}
Factor 15=5\times 3. Rewrite the square root of the product \sqrt{5\times 3} as the product of square roots \sqrt{5}\sqrt{3}.
\frac{5\sqrt{3}}{2\times 5}
Multiply \sqrt{5} and \sqrt{5} to get 5.
\frac{5\sqrt{3}}{10}
Multiply 2 and 5 to get 10.
\frac{1}{2}\sqrt{3}
Divide 5\sqrt{3} by 10 to get \frac{1}{2}\sqrt{3}.