Question 878138
{{{a/(a^2-4) - 2/(a^2-4)=(a-2)/(a^2-4)}}}
{{{a/(a^2-4) - 2/(a^2-4)=(a-2)/((a-2)(a+2))}}}
{{{a/(a^2-4) - 2/(a^2-4)=1/(a+2))}}}