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% latex_beta_pdf.tex
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\documentclass[12pt]{article}
\usepackage{amsmath}
\usepackage{graphicx}
\pagestyle{empty}
\begin{document}
\Large

\rotatebox{90}{$ f_X(x:\alpha,\beta) = \frac{\Gamma(\alpha +
\beta)}{\Gamma(\alpha)\Gamma(\beta)}x^{\alpha - 1}(1 - x)^{\beta - 1}$}

\end{document}


