Question 65792
{{{ ((c^2+d)/(d^3c^2))/(c^4+d^4) }}}
Make the denominator an improper fraction by placing it over 1
{{{ ((c^2+d)/(d^3c^2))/((c^4+d^4)/1) }}}
There is a rule :
{{{ (a/b)/(c/d) = ad/bc }}}
Apply it
{{{ (1(c^2+d))/((d^3c^2)(c^4+d^4)) }}}
Since nothing else can be factored ... you are done.