Consider the equivalence relation n $\Bbb R$ - {$0$}:
$a$~$b$ if and only if $\dfrac {a}{b} \in \Bbb Q $
In the following list of equivalence classes, find two classes which are equal:
[$\sqrt 3$] , [$1$], [$\sqrt {12}$], [$\sqrt 6$]
I have no idea how to do this question. Please prove the answer and explanations as this question could be on my test.