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a
-x(logx+1)+c
b
-x(logx+1)2+c
c
x(logx+1)+c
d
None of these
answer is C.
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Detailed Solution
I=∫logx(1+logx)2dx Let logx=t . Then x=et or dx=etdt . Thus, I=∫tet(t+1)2dt=∫(t+1-1)et(t+1)2dt (add and subtract et in the numerator) =∫et1(t+1)−1(t+1)2dt=ett+1+c=x(logx+1)+c using the formula (∫exf(x)+f′(x)dx=exf(x)+C)