For x>0, if f(x)=∫1xloget(1+t)dt, then f(e)+f1e is equal to
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a
12
b
0
c
1
d
-1
answer is D.
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Detailed Solution
f(x)=∫1xloget1+tdt f1x=∫11/xlogt1+tdt Put t=1z=∫1x-lnz1+1z-1z2dz=∫1xlnzz(1+z)dz=∫1xlntt(1+t)dt∴f(e)+f1e=∫1elnt1+tdt+∫1elntt(1+t)dt=∫1elnttdt=(lnt)221e=12