Let's substitute a=1/3 into the given expression:
(1/3 + 1)(1/3 - 1)(1/3² + 1) - (9 + 1/3²)^2= (4/3)(-2/3)(10/9 + 1) - (9 + 1/9)^2= (-8/9)(19/9) - (81 + 1/9)= -152/81 - (729/9 + 1/9)= -152/81 - 730/9= -152/81 - 810/81= -962/81
Therefore, the value of the expression is -962/81 when a=1/3.
Let's substitute a=1/3 into the given expression:
(1/3 + 1)(1/3 - 1)(1/3² + 1) - (9 + 1/3²)^2
= (4/3)(-2/3)(10/9 + 1) - (9 + 1/9)^2
= (-8/9)(19/9) - (81 + 1/9)
= -152/81 - (729/9 + 1/9)
= -152/81 - 730/9
= -152/81 - 810/81
= -962/81
Therefore, the value of the expression is -962/81 when a=1/3.