1. \begin{aligned}
\int \frac{6x}{\sqrt{1+x^2}} \ \textrm{d}x =
\end{aligned}
2. \begin{aligned}
\int \frac{x}{1+x^2} \ \textrm{d}x =
\end{aligned}
3. \begin{aligned}
\int \frac{x^2}{1-x^2} \ \textrm{d}x =
\end{aligned}
4. \begin{aligned}
\int \ln (2x+1) \ \textrm{d}x =
\end{aligned}
5. \begin{aligned}
\int -2 \sec^{4} \big( \frac{x}{2} – \pi \big ) \ \textrm{d}x =
\end{aligned}
6. \begin{aligned}
\int 2{x}^{3} \sin (3x-1) \ \textrm{d}x =
\end{aligned}
7. \begin{aligned}
\int (2x+1) \ \sqrt{x-1} \ \textrm{d}x =
\end{aligned}
8. \begin{aligned}
\int -3 \cos 3x \ \sqrt{1 \ – \cos 4x} \ \textrm{d}x =
\end{aligned}
9. \begin{aligned}
\int \Big( \sqrt{2x} \ – \ \frac{1}{\sqrt{2x}} \Big) \ \textrm{d}x =
\end{aligned}
10. \begin{aligned}
\int \frac{2}{4{x}^{2} \ – \ 1} \ \textrm{d}x =
\end{aligned}
11. \begin{aligned}
\int \frac{\textrm{d}x}{ \sqrt{x+2} \ – \ \sqrt{x} } =
\end{aligned}
12. \begin{aligned}
\int \frac{({x}^{3} \ – \ 27)}{(3 \ – \ x)} \ \textrm{d}x =
\end{aligned}
13. \begin{aligned}
\int 5x \ \csc(2{x}^{2}) \ \cot (2{x}^{2}) \ \textrm{d}x =
\end{aligned}
14. \begin{aligned}
\int \frac{{x}^{2}+9x+19}{{x}^{2}+8x+15} \ \textrm{d}x =
\end{aligned}
15. \begin{aligned}
\int \cos 4x \ \cos 3x \ \sin 2x \ \textrm{d}x =
\end{aligned}
16. \begin{aligned}
\int -2 \ln^{2} |x| \ \textrm{d}x =
\end{aligned}
17. \begin{aligned}
\int 2 \ \csc^{3} 2x \ \textrm{d}x =
\end{aligned}
18. \begin{aligned}
\int 2 \ \cos^{4} \frac{1}{2}x \ \sin^{3} \frac{1}{2}x \ \textrm{d}x =
\end{aligned}
19. \begin{aligned}
\int 3 \ \cos^{5} 2x \ \textrm{d}x =
\end{aligned}
20. \begin{aligned}
\int -3 \ \cot^{4} 2x \ \textrm{d}x =
\end{aligned}