$$2x^2-16$$

$$\lim_{x\to\infty}\left(\frac{e^{-x}}{x+1}\right)$$

$$\int_0^{\pi}3\cos^2\:x\:dx$$

$$\int-6e^xdx$$

$$\frac{\sqrt{3}}{6}\arctan\left(\frac{\sqrt{3}}{2}\tan\left(x\right)\right)$$

$$\frac{a+b}{2}\:+\:\frac{\left|a-b\right|}{2}$$

$$4ax+2a$$