(a+1)(a-1)(A2+1)

Dear student,

Assuming the question is  a+1a-1a2+1We have,a+1a-1a2+1=a2-1a2+1         --[using x2-y2=x+yx-y]=a4-1                         --[using identity again x2-y2=x+yx-y]

Regards

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