Question

1/(a+1)^2.1/(a-1)^2.2/a^2-1

Answer 1

(a+1)(a-1)/(a+1)^2*(a-1)^2
now try doing it by cancellation :)

Answer 2

a^2 - b^2 can also be written as (a+b)(a-b)
1 is equal to 1^2

Answer 3

3 answers are:
(a+1)^3(a-1)^3
(a+1)^2(a-1)^2
(a^2+1)(a^2-1)

Answer 4

Sorry did not see the 2...
in that case, the answer would be 2/(a+1)^3*(a-1)^3

Answer 5

tuvm