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import {HALF_PI} from '../constants/values';
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export default function(eccent, phi, sinphi) {
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var con = eccent * sinphi;
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var com = 0.5 * eccent;
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con = Math.pow(((1 - con) / (1 + con)), com);
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return (Math.tan(0.5 * (HALF_PI - phi)) / con);
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}
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