For $0 < x < 1, \int\left[\tan ^{-1}\left(1-x+x^2\right)+\tan ^{-1}(1-x)\right] d x=$
- A
$x \cot ^{-1} x+\log \sqrt{1+x^2}+C$
- B
$x \tan ^{-1} x-\log \left(1+x^2\right)+C$
- C
$x \cot ^{-1} x+\frac{3}{4} \log \left(1+x^2\right)+C$
- D
$x \tan ^{-1} x-\frac{3}{4} \log \sqrt{1+x^2}+C$
✓ Correct answer: A
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