If (x-1) (x + 1) =1, Find (x+1)³- 1/(x+1)3+4=?

If (x-1) (x + 1) =1, Find (x+1)³- 1/(x+1)3+4=?

(a)          6

(b)          27

(c)           18

(d)          9.

Sol:

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