$$\log_{16}\left(0.25\right)$$

$$\left(-1-2x\right)\cdot\left(-1+2x\right)$$

$$\lim_{x\to\infty}\frac{\left(2^x+4^x\right)}{5^x-2^x}$$

$$\frac{d^2}{dx^2}\left(\frac{x^2-y^2}{x^2+y^2}\right)$$

$$\left(10z+25m\right)^2$$

$$x+\frac{1}{5}>\frac{7}{20}$$

$$\left(x\:-\:\frac{1}{2}\right)\left(x^2\:-\:\:x\:+\:\frac{1}{4}\right)$$