$f\left(x\right)=\frac{8}{\left(1-x^3\right)}$

$\left(-3ab^2\right)\left(-a^2b^3\right)$

$\lim_{x\to\infty}\left(\frac{3x^3}{x^2+1}\right)$

$\left(u-21\right)\left(-8\right)$

$120+85+45$

$\int_{0.5}^1\arccos\left(\sqrt{x}\right)\sqrt{x}dx$

$\frac{d}{dx}\left(x^2+6\right)^{\left(x^2+3\right)}$