Question 21171
{{{(x^2-64)/(x^2-36)*(x-6)/(x+8)}}}
={{{((x+8)*(x-8)*(x-6))/((x+6)*(x-6)*(x+8))}}}
={{{((cross(x+8))*(x-8)*(cross(x-6)))/((x+6)*(cross(x-6))*(cross(x+8)))}}}
={{{(x-8)/(x+6)}}}