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Question

Evaluate : limx1(11x31x3)

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Solution

L=limx1=11x3(1x3)=limx1x2+x+13(1x)(x2+x+1)limx1x2+x2(1x)(x2+x+1)=limx1x2+2xx2(1x)(x2+x+1)=limx1x(x+2)1(x+2)(1x)(x2+x+1)=limx1(x1)(x+2)(1x)(x2+x+1)=lim(x+2)x2+x+1=(1+2)1+1+1=35=1

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