$\int\left(2x^3-1\right)e^{\left(x^4-2x\right)}dx$

$\frac{x^2-5x+4}{\:x^2-4}\le\:1$

$\lim_{x\to\infty}\left(\frac{3x^2+27}{\text{x}-3\left(x^2+3x+9\right)}\right)$

$3x\:+\:4y\:+\:8x\:+\:2y\:\:\:\:$

$\left(x^2+3\right)\left(x^2+2\right)$

$y=t^4-\frac{4}{3}t^3-12t^2$

$\left(5x^3-\frac{1}{4}\right)\frac{3}{20}y$