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\frac{\frac{1}{2}}{\sqrt{1-\frac{1}{4}}}
Calculate \frac{1}{2} to the power of 2 and get \frac{1}{4}.
\frac{\frac{1}{2}}{\sqrt{\frac{4}{4}-\frac{1}{4}}}
Convert 1 to fraction \frac{4}{4}.
\frac{\frac{1}{2}}{\sqrt{\frac{4-1}{4}}}
Since \frac{4}{4} and \frac{1}{4} have the same denominator, subtract them by subtracting their numerators.
\frac{\frac{1}{2}}{\sqrt{\frac{3}{4}}}
Subtract 1 from 4 to get 3.
\frac{\frac{1}{2}}{\frac{\sqrt{3}}{\sqrt{4}}}
Rewrite the square root of the division \sqrt{\frac{3}{4}} as the division of square roots \frac{\sqrt{3}}{\sqrt{4}}.
\frac{\frac{1}{2}}{\frac{\sqrt{3}}{2}}
Calculate the square root of 4 and get 2.
\frac{2}{2\sqrt{3}}
Divide \frac{1}{2} by \frac{\sqrt{3}}{2} by multiplying \frac{1}{2} by the reciprocal of \frac{\sqrt{3}}{2}.
\frac{2\sqrt{3}}{2\left(\sqrt{3}\right)^{2}}
Rationalize the denominator of \frac{2}{2\sqrt{3}} by multiplying numerator and denominator by \sqrt{3}.
\frac{2\sqrt{3}}{2\times 3}
The square of \sqrt{3} is 3.
\frac{\sqrt{3}}{3}
Cancel out 2 in both numerator and denominator.