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$\displaystyle \varepsilon$%
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$\displaystyle N$%
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$ R-w+w_x$%
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$ (R-w+w_x)(\pi/N - \varepsilon)$%
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\begin{displaymath}\begin{split} \frac{S}{2N} &= (R-w+w_x)(\frac{\pi}{N} - \varepsilon) + (r_1+w_x)a+(R-w-r_1)\frac{\sin{\varepsilon}}{\sin{\eta}}\\ & \quad - (r_1+w_x)\tan{(\frac{\pi}{2}-\eta)}\\ \end{split}\end{displaymath}%
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\begin{displaymath}\begin{split} \frac{\delta S}{\delta w_x} &= 2N\left[ \frac{\pi}{N} -\varepsilon + a - \tan{(\frac{\pi}{2} - \eta)} \right]\\ &= 2N\left[ \frac{\pi}{2} - \eta + \frac{\pi}{N} - \tan{(\frac{\pi}{2} - \eta)} \right]\\ \end{split}\end{displaymath}%
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$\displaystyle \varepsilon = 30 deg$%
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$ r_1 = 1/16 in$%
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$\displaystyle w = 0.500$%
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\includegraphics[]{img/res.ps}%
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\includegraphics[height=4in]{img/perimeter.ps}%
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\end{document}