$\int\left(t^{2}-2\right)\sen\left(\frac{2}{3}t\right)dt$

$\int5\sen^{3}\left(3x\right)\cos^{3}\left(3x\right)dx$

$\left(2xy+9z^2\right)^2$

$\frac{3x-14}{x}<3$

$\int3x^2\sqrt[3]{2+x^3}dx$

$\int\frac{2x-3}{x^3\left(x^2-2x\right)}dx$

$\frac{1}{\frac{1}{\cos\left(x\right)}+\tan\left(x\right)}=\frac{1-\sin\left(x\right)}{\cos\left(x\right)}$