$\left(\frac{9}{7}x^8+\frac{5}{6}y^4\right)\left(\frac{9}{7}x^8-\frac{5}{6}y^4\right)$

$x^8-2x^7-x^6$

$4x\:+\:12\:\ge\:x^2$

$\left(\left(x+2\right)\left(x-5\right)\right)^2$

$a^2-9a+32$

$x^4-25x^2+144$

$\lim_{x\to\infty}\left(\frac{e^{2x}}{\left(ln\left(x\right)\right)^2}\right)$