$$\lim_{x\to\infty}\left(\frac{\cos\left(x\right)-1}{\sin^2\left(x\right)}\right)$$

$$\frac{dy}{dx}-y=2e^{2x}y^2$$

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

$$\cot\frac{3\pi}{5}x-1=0$$

$$5\frac{3}{4}-3\frac{1}{4}$$

$$\frac{d}{dx}\left(\frac{q^2}{a}+\frac{p^2}{2}=36\right)$$

$$6x+16$$