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((lim)(xvecoo)int0x(tan^(-1)t)^2dt)/(sqr...

`((lim)_(xvecoo)int0x(tan^(-1)t)^2dt)/(sqrt(x^2+1))h a st h ev a l u e` zero (b) `pi/4` (c) 1 (d) `(pi^2)/4`

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