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int0^1cot^(- 1)(1-x+x^2)dx...

`int_0^1cot^(- 1)(1-x+x^2)dx`

A

log 2

B

`(pi)/(2)- log 2`

C

`(pi)/(2) + log 2`

D

`-log 2`

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The correct Answer is:
B
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