$\left(\frac{8}{5}x^4+\frac{5}{11}\right)\left(\frac{8}{5}x^4-\frac{2}{31}\right)$

$f\left(x\right)=-3x^{2}+4x-1$

$\int\frac{5a}{3b}dx$

$\lim_{x\to1}\left(\frac{e^{x^2}-e}{3x-3}\right)$

$\frac{1}{3}\left(x^2+x-12\right)$

$-3a+52a$

$\lim_{x\to\infty}\left(\frac{\sin\left(5t\right)}{2t}\right)$