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The tangent int(-1/2)^(1/2)([x]+ln((1+x)...

The tangent `int_(-1/2)^(1/2)([x]+ln((1+x)/(1-x)))\ dx` equals, where `[\ ]` denotes greatest integer function a.`-1/2` b. `\ 0` c.`\ 1` d. `2ln\ (1/2)`

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