polymorphic8.tex
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	\documentclass[12pt]{article}

	\begin{document}

	\begin{eqnarray*}
	f_{c,1,IJ}=\left\{\begin{array}{lr}
	1, & r\leq r_{s,1,IJ} \\
	\frac{1}{2}+\frac{1}{2} cos \left[\frac{\pi \left(r-r_{s,1,IJ}\right)}{r_{c,1,IJ}-r_{s,1,IJ}}\right], & r_{s,1,IJ}<r<r_{c,1,IJ} \\
	0, & r \geq r_{c,1,IJ} \\
	\end{array}\right.
	\end{eqnarray*}

	\end{document}