$$\lim_{x\to\infty}\left(\frac{e^{x^5}}{5-x^6}\right)$$

$$\left(x^2-4\right)\left(x^2-4x\right)$$

$$36x^2-4y^2$$

$$\left(s+1-y\right)\left(s+1+y\right)$$

$$a\:+\:8\:=\:2$$

$$\lim_{x\to-1}\left(\frac{x^3-7x^2+4x+12}{x+1}\right)$$

$$20+2\left(3x+10\right)=2x-3\left(3+x\right)$$