$\frac{2}{\sqrt{3}}$ units

$\frac{4}{\sqrt{3}}$ units

$\sqrt{3}$ units

$\frac{1}{\sqrt{3}}$ units

$\quad \log (\sec x+\tan x)+2 \tan \left(\frac{x}{2}\right)+\mathrm{c}$, where c is the constant of integration

$\quad \log (\sec x+\tan x)-2 \tan \left(\frac{x}{2}\right)+\mathrm{c}$, where c is the constant of integration

$\log (\sec x+\tan x)+\tan \left(\frac{x}{2}\right)+\mathrm{c}$, where c is the constant of integration

$\log (\sec x+\tan x)-\tan \left(\frac{x}{2}\right)+\mathrm{c}$, where c is the constant of integration

$\frac{24}{169}$

$\frac{26}{169}$

$\frac{27}{169}$

$\frac{28}{169}$

$30^{\circ}$

$135^{\circ}$

$150^{\circ}$

$120^{\circ}$