Question 152601
{{{(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^2-1)+(a+1)^2/(a^2-1)}}}
={{{((a-1)^2+(a+1)^2)/(a^2-1)}}}
={{{(a^2-2a+1+a^2+2a+1)/(a^2-1)}}}
={{{(2a^2+2)/(a^2-1)}}}
={{{2(a^2+1)/(a^2-1)}}}