$$x^2+x^2+4x+9$$

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

$$\int\frac{x^2}{-\left(2x+1\right)\left(2x-3\right)^3}dx$$

$$182-1182-1182-1$$

$$\csc^2\left(p\right)\cdot\tan^2\left(p\right)-1=\tan^2\left(p\right)$$

$$\frac{dy}{dx}=\frac{\left(4200-y\left(x\right)\right)}{100}$$

$$\left(3k+10h\right)\left(3k+2h\right)$$