$$7-9-\left(-4\right)+2$$

$$m^2x+mx^2y+mx$$

$$\lim_{x\to\infty}\left(x+e^x\right)^{x^{-1}}$$

$$\left(2x-\frac{1}{8}\right)\left(2x+\frac{1}{8}\right)$$

$$\left(r+2\right)^2$$

$$\frac{d}{dx}y=6^{z^5}$$

$$2\ln\left(4x\right)$$