(x3-1)/(x-1)=(x-1)(x2+x+1)/(x-1)

(x3-1)/(x-1)=(x2+x+1)

put limit x=1

(x2+x+1)=(1+1+1)=3

(x3-1)/(x-1)=(x2+x+1)

put limit x=1

(x2+x+1)=(1+1+1)=3

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