(a ^ 3 + 2a ^ 2)/(a ^ 2 - 1) * ((a + 1) ^ 3 * (a - 1))/(a ^ 2 * (a + 2))
Ответ
1
...= a²×(a+2)×(a+1)³/a²×(a+2) = (a+1)³ = a³+3a²+3a+1