$$\lim_{t\to\infty}2\sqrt{t}e^{-\sqrt{t}}$$

$$\frac{3}{x-1}+\frac{1}{x}=2$$

$$3s^2+14s+8$$

$$\frac{d^2}{dx^2}\left(\frac{x^5}{10}-\frac{x^4}{4}-\frac{17x^3}{6}+15x^2-1\right)$$

$$2x+\frac{y^3}{x}+\frac{x^2}{y}-1$$

$$\left(p+3q-\frac{1}{3}z\right)^2$$