Question 251932
(t+1)(t^2-1)
____________
(t-1)(t+1)^2
right away I see we can cancel out (t+1)
(t^2-1)/(t-1)(t+1)
surprise! surprise!
(t^2-1)=(t-1)(t+1)
so now we have 
(t-1)(t+1)/(t-1)(t+1)
1/1=1