$$(v)\int \sin^{2}\theta\ \cos\ \theta\ d\theta; (vi)\int\frac{1}{\sqrt{4-9x^{2}}}dx$$
$\frac{\left(\sin(\theta )\right)^{3}}{3}+С,\ \frac{\arcsin(\frac{3x}{2})}{3}+С_{1}$
$|x|<\frac{2}{3}$
