$\frac{4}{\sqrt{5}}$
$\frac{3}{\sqrt{3}}$
$\frac{7}{\sqrt{7}}$
$\frac{1}{1+\sqrt{2}}$
$\frac{2}{\sqrt{11}}$
$\frac{3}{\sqrt{7}}$
$\frac{3}{5+\sqrt{3}}$
Special products is the multiplication of algebraic expressions that follow certain rules and patterns, so you can predict the result without necessarily doing the multiplication.
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