$$4m^2-16n^2$$

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

$$\int\frac{7x^2}{\left(x^2+169\right)^2}dx$$

$$\frac{-4x^4y^0z^7}{2x^{-3}y^0z^7}$$

$$4a^2+3a-\frac{a}{2}-5a^2$$

$$\frac{d}{dx}3x^4e^{2x+3}$$

$$\left(2x-6\right)\left(3x+4\right)$$