Упростите выражение( во вложении)))

((a-1)/( ∛a -1) -(a+1)/(∛a +1))*2/∛a =((∛a-1)((∛a)²+∛a +1 )/( ∛a -1) -(∛a+1)((∛a)² - ∛a+1)/(∛a +1))*2/∛a  =(∛a)² +∛a +1 -(∛a)² - ∛a+1))*2/∛a  =2∛a *2/∛a  =4.

1)(∛a-1)(∛a²+∛a+1)/(∛a-1)-(∛a+1)(∛a²-∛a+1)/(∛a+1)=
=∛a²+∛a+1-∛a²+∛a-1=2∛a
2)2∛a*2/∛a=4