\documentclass{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.8}

%define style
\tikzset{MyAnnotation/.style={draw=blue,ultra thick,rounded corners,font={\color{green}\bfseries}}}

%define command
\newcommand\plotannotation[2][0.4,.6]{\node [red] at (rel axis cs:#1) {#2};}

\begin{document}
\begin{tikzpicture}
\begin{axis}[width=10cm]
    \addplot {x^2};
    \node at (rel axis cs:0.4,0.9) {ABC};

    %use style
    \node [MyAnnotation] at (rel axis cs:0.4,0.75) {DEF};

    % use command

Psmith, the TeX bot, in fixed font mode: Let's take a look at the last cricket results:

- Derbyshire 201/7 * v Sussex
- Glamorgan 231/10  v Essex 46/3 *
- Northamptonshire 166/4 * v Leicestershire
- Nottinghamshire 274/10  v Surrey 29/3 *
- Somerset v Middlesex 347/10 *
- Warwickshire 128/10  v Yorkshire 58 *
- Cambridge MCCU 98/10 * v Gloucestershire 342/5
- Rest of Sri Lanka v Sri Lanka A
- England 37 * v New Zealand
- Kings XI Punjab v Delhi Daredevils

Our cricket expert David might explain these results later on.

<latex>
  <package name="geometry">
    <command name="geometry">
      <key name="columnsep" description="..." datatype="..." />
      <key name="voffset"  description="..." datatype="..." />
    </command>
  </package>
  <package name="listings">
    <environment name="lstlisting">
      ...
    </environment>
  </package>
</latex>

  > read.csv(file = "memory1.log", header = FALSE, sep = " ", colClasses = c(NA, NA, NA, NA, NA))

Psmith, the TeX bot, in fixed font mode: Let's take a look at the last cricket results:

- Derbyshire 223/10  v Sussex 73/3 *
- Glamorgan 231/10  v Essex 120/4 *
- Northamptonshire 229/6 * v Leicestershire
- Nottinghamshire 274/10  v Surrey 73/6 *
- Somerset 96/5 * v Middlesex 347/10
- Warwickshire 128/10  v Yorkshire 128/3 *
- Cambridge MCCU 83/4 &  98/10 * v Gloucestershire 342/5
- Rest of Sri Lanka 9/1 * v Sri Lanka Cricket Combined XI 258/8
- England 84/2 * v New Zealand
- Kings XI Punjab v Delhi Daredevils

Psmith, the TeX bot, in fixed font mode: Let's take a look at the last cricket results:

- Derbyshire 223/10  v Sussex 218/5 *
- Glamorgan 231/10  v Essex 211/6 *
- Northamptonshire 355/10 * v Leicestershire
- Nottinghamshire 274/10  v Surrey 177/8 *
- Somerset 11/2 &  152/10 * v Middlesex 347/10
- Warwickshire 128/10  v Yorkshire 233/5 *
- Cambridge MCCU 162/10 &  98/10 * v Gloucestershire 342/5
- Rest of Sri Lanka 91/4 * v Sri Lanka Cricket Combined XI 258/8
- England 134/3 * v New Zealand
- Kings XI Punjab 103/2 * v Delhi Daredevils

Psmith, the TeX bot, in fixed font mode: Let's take a look at the last cricket results:

- Derbyshire 223/10  v Sussex 328/8 *
- Glamorgan 231/10  v Essex 343/9 *
- Northamptonshire 355/10  v Leicestershire 89/1 *
- Nottinghamshire 274/10 &  24/1 * v Surrey 207/10
- Somerset 112/5 &  152/10 * v Middlesex 347/10
- Warwickshire 128/10  v Yorkshire 318/7 *
- Cambridge MCCU 162/10 &  98/10 * v Gloucestershire 342/5
- Rest of Sri Lanka 259/7 * v Sri Lanka Cricket Combined XI 258/8
- England 160/4 * v New Zealand

  \begin{align*}
    f(x)
      &=\begin{aligned}[t]a_0
        &+a_1\cos 1\omega x+b_1 \sin 1\omega x\\
        &+a_2\cos 2\omega x+b_2 \sin 2\omega x\\
        &+\cdots
        \end{aligned} \\
      &=\sum_{n=0}^{\infty}
        (a_n\cos(n\omega x)+b_n\sin(n\omega x))
  \end{align*}

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{align*}
f(x)
&=a_0+a_1\cos 1\omega x+b_1 \sin 1\omega x\\
&\phantom{{}=a_0}+a_2\cos 2\omega x+b_2 \sin 2\omega x\\
&\phantom{{}=a_0}+\dotsb\\
&=\sum_{n=0}^{\infty}(a_n\cos(n\omega x)+b_n\sin(n\omega x))
\end{align*}
\end{document}