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

Question

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

Answer 1

Ответ:

(1-a)(1-a²)+(1+a²)(1+a²)-2a(1+a)(a-1)=1-a²-a+a³+1+a²+a+a³-2a(a²-1)=

2+2a³-2a³+2a=2a+2=2(a+1).