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The equal to integral 01log(1x+1+x)dx is

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a
12log⁡2−12+π4
b
12log⁡2−1+π2
c
13log⁡4−1+π8
d
14log⁡3−1+π2

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detailed solution

Correct option is B

I=∫01 log⁡(1−x+1+x)dx=xlog⁡(1−x+1+x)]01−∫01 x11−x+1+x−121−x+121+xdx=log⁡(2)+12∫01 x1−x+1+x1+x−1−x1−x2dx=12log⁡2+12∫01 x(1+x)−(1−x)1+x+1−x−21−x21−x2dx=12log⁡2+12∫01 11−x2−1dx=12log⁡2+π2−1.


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