$$4x+7y-x-y$$

$$\left(\frac{1}{8}x+\frac{3}{7}xy\right)^2$$

$$\frac{1}{2}-\frac{1}{2}\cos\left(12x\right)$$

$$\frac{x^2-1}{x^5-1}$$

$$\frac{2a^4b^{10}}{5a^8b^{10}}$$

$$\int_x^{-1}\ln\left(t^2+1\right)dt$$

$$x^2\:-\:1\:\le\:\left(x-1\right)^2\:\:-\:5$$