Question 1008501
 
 {{{((x^3-y^3)/(x+y))  ((3x^2-3y^2)/(x^2+xy+y^2)) }}}

recall that {{{x^3-y^3=(x-y)(x^2+xy+y^2)}}}
 

{{{(((x-y)(x^2+xy+y^2))/(x+y))  ((3x^2-3y^2)/(x^2+xy+y^2)) }}}...simplify


{{{(((x-y)cross((x^2+xy+y^2)))/(x+y))((3x^2-3y^2)/cross((x^2+xy+y^2))) }}}


{{{((x-y)/(x+y))  (3(x^2-y^2)/1) }}}.......{{{x^2-y^2=(x-y)(x+y)}}}


{{{((x-y)/(x+y)) (3(x-y)(x+y)) }}}...simplify


{{{((x-y)/cross((x+y))) 3cross( (x+y))(x-y)) }}}


{{{3(x-y) (x-y) }}}


{{{3(x-y) ^2 }}}