Question 271684
{{{(a-1)/(a+1) + (a+1)/(a-1)}}}
{{{(a-1)/(a+1)*(a-1)/(a-1) + (a+1)/(a-1)*(a+1)/(a+1)}}}

{{{((a-1)^2+(a+1)^2)/((a+1)*(a-1))}}}

{{{((a-1)^2+(a+1)^2)/(a^2-1))}}}
{{{(1-2a+a^2 + 1+2a+a^2)/(a^2-1)}}}

{{{(2a^2 +2)/(a^2-1)}}}
{{{2*(a^2 + 1)/(a^2-1)}}}