Question 118581
{{{(a(a-b)^2/4b) * (4b/a(a^2 -b^2 ))}}}


{{{(a(a-b)(a-b)/4b) * (4b/a(a-b)(a+b))}}}


{{{(cross(a)(a-b)cross((a-b))/cross(4b)) * (cross(4b)/cross(a)(cross((a-b)))(a+b)))}}}


{{{(a-b)/(a+b)}}}