$$8\left(3\right)+5$$

$$4x^2-36xy+81y^2$$

$$4\::\:-2\:=\:$$

$$sin\:\left(p+q\right)$$

$$\frac{10^8}{10^{18}}$$

$$\sqrt[x]{\left(-1\right)^x}$$

$$\frac{dy}{dx}\left(x^3+sin\left(xy\right)=y^2\cdot tan\left(x\right)\right)$$