$\int x\left(\frac{sen\left(2u\right)}{cos\left(u\right)}\right)dx$

$x-3\le0$

$14x^2-33x-5=0$

$\frac{d^3}{dx^3}\left(x^3-8\right)^4$

$\frac{3}{4}-3tan\left(x+\pi\right)=1-\frac{13}{4}tan\left(x+\pi\right)$

$\left(15-7\right)\left(9-4\right)$

$\frac{x^3-5x^2+8}{x^2-x}$