$$\frac{x-5}{x^2-x-2}$$

$$\lim_{x\to8}\frac{3x^2-24}{x^2-64}$$

$$\int x^3b^{2x}dx$$

$$\int\left(\cot\left(3x\right)\right)dx$$

$$4a^4-12a^2+9$$

$$y\left(3y+5\right)+5\left(3y+5\right)$$

$$+1-\left(-4+3-1\right)-4+4$$