Some Miscellaneous LaTeX

\mathcal{E}       % for EMF, like U+0190 Ɛ

N$\cdot$m         % N·m

360$^{\circ}$     % degree sign

V_{\text{back}}   % text in subscript

% If you want equations to be numbered, rather than
% using $$a = b + c$$, use:
\begin{equation}
a = b + c
\end{equation}

% align equations (centered, aligned on =)
$$\begin{align}
a &= b + c\\
a^2+b^2 &= c^2\\
\theta &= 2\pi
\end{align}$$

% larger parens (auto-sized)
\left( \frac{2\pi\;\text{rad}}{1\;\text{rev}} \right)

\to                 % same as \rightarrow

\boxed{a = b}       % box an equation

\mathbf{v}          % vector
\mathbf{\hat{x}}    % unit vector

\overline{v}

2.5 \times 10^{-4}  % scientific notation

\pagenumbering{gobble} % at top of document
\vspace{1.5cm}

\newpage

\begin{center}
...
\end{center}