3/(a+1)-12/(a²-1)-6/(1-a)
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3/(a+1)-12/(a²-1)-6/(1-a)
3/(a+1)-12/(a²-1)-6/(1-a)
3/(a+1)-12/(a²-1)-6/(1-a)
3/﹙a+1﹚-12/﹙a²-1﹚-6/﹙1-a﹚
=﹙3a-3﹚/﹙a²-1﹚-12/﹙a²-1﹚+﹙6a+6﹚/﹙a²-1﹚
=﹙3a-3-12+6a+6﹚/﹙a²-1﹚
=9﹙a-1﹚/﹙a²-1﹚
=9/﹙a+1﹚.
3/(a+1)-12/(a²-1)-6/(1-a)
=3/(a+1)-12/(a²-1)+6/(a-1)
=(3a-3-12+6a+6)/(a²-1)
=(9a-9)/(a²-1)
=9(a+1)