MCQ
$\int_{}^{} {\frac{{dx}}{{1 + x + {x^2} + {x^3}}} = } $
- ✓$\log \sqrt {1 + x} - \frac{1}{2}\log \sqrt {1 + {x^2}} + \frac{1}{2}{\tan ^{ - 1}}x + c$
- B$\log \sqrt {1 + x} - \log \sqrt {1 + {x^2}} + {\tan ^{ - 1}}x + c$
- C$\log \sqrt {1 + {x^2}} - \log \sqrt {1 + x} + \frac{1}{2}{\tan ^{ - 1}}x + c$
- D$\log \sqrt {1 + x} + {\tan ^{ - 1}}x + \log \sqrt {1 + {x^2}} + c$
