]> $$\overrightarrow{A}+\overrightarrow{B}=\overrightarrow{C}$$ $$\overrightarrow{A}=a\stackrel{‸}{x}+b\stackrel{‸}{y}+c\stackrel{‸}{z}$$ $$\overline{z}=x+iy$$ $$$$ $$\underset{a}{\overset{b}{\int }}\frac{1}{x}dx=\ln x{|}_a^b=\ln \frac{b}{a}$$ $$$$ $$y\prime =\frac{dy}{dt}$$ $$\nabla \equiv \frac{\partial x}{\partial t}+\frac{\partial y}{\partial t}+\frac{\partial z}{\partial t}$$ $$$$ $${A_0}^2$$ $${B^2}_0$$ $${\stackrel{\sim }{c}}_1$$ $${\stackrel{9}{t}}_0$$ $$\frac{\sqrt{a+b}}{\sqrt[8]{b+c}}$$ $$\underset{a+b}{\overset{c+d}{U}}+V$$ $$$$