$\lim_{x\to\infty}\frac{\left(\cos\left(\frac{2}{x}\right)\right)}{x^{-3}}$

$\left(b^2-4x^2b^2-2xb^2\right)\left(-6xb^2+x^2b^2\right)$

$-x^2+2x-10$

$-\left(m+3n\right)^3$

$\lim_{x\to3}\left(\frac{-5\cdot\ln\left(x-2\right)}{x-3}\right)$

$-1+3+7\cdot4$

$\int\frac{\left(6x-3\right)}{x^2-9x+8}dx$