$\int\left(\sin^3\left(3x\right)\cdot\cos\left(3x\right)\right)dx$

$y=ln\:2x^3$

$\lim_{x\to7}\left(\frac{x^3+x^2-37x-35}{7-x}\right)$

$\int_{tanx}^{\frac{1}{x}}\left(sen\:t^2\right)dt$

$y''-2y'-8y=0$

$-3-5\cdot6$

$\int\frac{x^3-3x+4}{\left(x+3\right)^2\left(x+1\right)}dx$