证明lim(x→1)(x^2-1)=0我有解题过程但看不懂.

证明lim(x→1)(x^2-1)=0
我有解题过程但看不懂.

x^2-1=(x+1)(x-1)
when x→1 then (x-1→0 and x+1!is R)
because 0*R=0
right