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Q.

ln(exx+1)+(ln(xx))21+(xlnx)(lne2xx)dx=f(x)+c  where  c is integral constant and  f(1)=0, then  eef21  is equal to

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a

2

b

4

c

0

d

8

answer is B.

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Detailed Solution

1+(x+1)lnx+x(lnx)21+(xlnx)(2+xlnx)dx=1+lnx1+xlnxdx  =ln(1+xlnx)+c  ef(x)=1+xlnx ef(2)1=ln4

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