$$\sqrt{x^{\frac{3}{4}}}x$$

$$\sqrt[2.1]{9}$$

$$\lim_{w\to39}\left(\frac{\cos\left(wx\right)-\cos\left(39x\right)}{1521-w^2}\right)$$

$$\left(\:5x-2\right)\left(5x\:-2\right)$$

$$\lim_{x\to0}\left(e^{2x}-2x\right)^{\frac{1}{x}}$$

$$25^4+54x^2y^2+49^4$$

$$\left(x+y\right)a+\left(x+y\right)b+\left(x+y\right)c$$