$\frac{x}{\sqrt{1+x^2}}+C$

$\log \left|x+\sqrt{1+x^2}\right|+C$

$x+\sqrt{1+x^2}+C$

$\frac{\left(x+\sqrt{1+x^2}\right)^2}{2}+C$

$\frac{4}{15}\left(\frac{\left(x^3-1\right)^5}{x^{15}}\right)^{1 / 4}+C$

$\frac{4}{15}\left(\frac{x^4+1}{x^4}\right)^{1 / 4}+C$

$\frac{\sqrt{x^4+x^2+1}}{x}+C$

$\frac{3}{4}\left(x^{4 / 3}+x^{1 / 3}\right)+C$

23

24

25

26

$\frac{x^2}{\sqrt{4-x^2}}-\sin ^{-1}\left(\frac{x}{2}\right)+C$

$\frac{x}{\sqrt{4-x^2}}-\tan ^{-1}\left(\frac{x}{\sqrt{4-x^2}}\right)+C$

$\frac{x}{\sqrt{4-x^2}}+\sin ^{-1}\left(\frac{2}{\sqrt{4-x^2}}\right)+C$

$\sqrt{4-x^2}-\tan ^{-1}\left(\frac{x}{2}\right)+C$