Question

Сократите дробь ((a−1)(a+1))/(a^4−2a^2+1)

Answer 1

((a−1)(a+1))/(a^4−2a^2+1)=(a^2-1)/(a^2-1)^2=1/(a^2-1)

Answer 2

(А^2-1)/(а^2-1)^2=1/а^2-1