1. ${\int }_0^x\frac{{\tan }^{-1}u}{1+u^2}du$

• A. $\frac{1}{2}{\left({\tan }^{-1}x\right)}^2$
• B. $\frac{1}{2}{\left({\tan }^{-1}x\right)}^2$
• C. $\frac{1}{2}{\left({\tan }^{-1}x\right)}^2$
• D. $\frac{1}{2}{\left({\tan }^{-1}x\right)}^2$

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