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Question

Evaluate :

limx(x2x+1+x)

A
13
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B
12
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C
14
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D
15
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Solution

The correct option is B 12
limx(x2x+1+x)

=limy(y2+y+1y),where y=x

=limy(y2+y+1y)(y2+y+1+y)y2+y+1+y

=limyy2+y+1y2y2+y+1+y

=limyy+1y2+y+1+y

=limy1+1y1+1y+1y2+1=12

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