Rationalising the denominator by Boxed Rockets

Rationalise the Denominator

\frac{3}{2 + \sqrt{10}}

- \frac{2 - \sqrt{10}}{2}

\frac{\sqrt{6}}{1 + \sqrt{6}}

- \frac{\sqrt{6} - 6}{5}

\frac{9 + \sqrt{3}}{4 + \sqrt{3}}

\frac{33 - 5 \sqrt{3}}{13}

\frac{5 - \sqrt{7}}{7 + \sqrt{7}}

\frac{7 - 2 \sqrt{7}}{7}