$-x^3-10x^2-28x-24$

$\lim_{x\to0}\left(\frac{xtg\left(x\right)-ln\left(x+1\right)+x}{\sin^2\left(x\right)}\right)$

$-2\left(3a-5b-7\right)+9a$

$w^2\:-4w-12\:=\:0$

$\left(-99\right)-\left(+23\right)+\left(-42\right)-\left(-38\right)$

$\left(0.123\right)^3\cdot\left(7\right)^3$

$\int\frac{x^2+2}{x^3-6x}dx$