$$2\sqrt{3}-\sqrt{3}+4\sqrt{3}$$

$$8x-3+x-1$$

$$28+56f+28w$$

$$0.406=\frac{1-sen\left(x\right)}{1+sen\left(x\right)}$$

$$\sqrt{\frac{a^{13}}{a^6}}$$

$$\left(5q\:+\:10r\right)\left(5q\:-\:10r\right)\:$$

$$\sqrt[4]{9^2}$$