Question 1133230
simplify {{{(x^3+1)^-1 + (x^-3 + 1)^-1}}}

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

={{{1/(x^3+1) + 1/(1/x^3 + 1)}}}

={{{1/(x^3+1) + 1/((1+ x^3 )/x^3 )}}}

={{{1/(x^3+1) + x^3/(1+ x^3  )}}}

={{{(1+ x^3)/(1+ x^3  )}}}

={{{1}}}