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Question

(1+ln2x)21+ln(2x)2x+1+(ln(2x)2x)2 dx is equal to (where c is constant of integration)

A
ln|1+xlnx|+c
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B
12 ln|1+x lnx|+c
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C
12 ln|1+2x ln 2x|+c
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D
ln|1xlnx|+c
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Solution

The correct option is C 12 ln|1+2x ln 2x|+c
(1+ln2x)21+(2x+1)ln2x+2x(ln2x)2dx=(1+ln2x)2(1+2xln2x)(1+ln2x)dx1+2xln2x=t2(1+ln2x)dx=dt=12dtt=12lnt+c=12ln|1+2x ln2x|+c

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