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-\sqrt{1-\frac{4}{169}}
Calculate \frac{2}{13} to the power of 2 and get \frac{4}{169}.
-\sqrt{\frac{169}{169}-\frac{4}{169}}
Convert 1 to fraction \frac{169}{169}.
-\sqrt{\frac{169-4}{169}}
Since \frac{169}{169} and \frac{4}{169} have the same denominator, subtract them by subtracting their numerators.
-\sqrt{\frac{165}{169}}
Subtract 4 from 169 to get 165.
-\frac{\sqrt{165}}{\sqrt{169}}
Rewrite the square root of the division \sqrt{\frac{165}{169}} as the division of square roots \frac{\sqrt{165}}{\sqrt{169}}.
-\frac{\sqrt{165}}{13}
Calculate the square root of 169 and get 13.