The witch of Agnesi

math/agnesi_witch.tex

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+\documentclass{standalone}
+%
+\usepackage{tikz}
+\usepackage{pgfplots}
+\pgfplotsset{width=10cm,compat=1.9}
+
+\usepackage{xcolor}
+\definecolor{space}{HTML}{0A2543}
+%
+\title{The Witch of Agnesi}
+\begin{document}
+	\begin{tikzpicture}[domain=-15:15]
+		\begin{scope}[scale=2]
+			\begin{axis}
+				\foreach \a in {1,2,4,8}
+					\addplot [domain=-15:15, samples=100, color=space, thick]{8 * \a^2 / (x^2 + 4 * \a)};
+			\end{axis}
+		\end{scope}
+	\end{tikzpicture}
+\end{document}