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PhabricatorCosChartFunction.php
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			<?php

			final class PhabricatorCosChartFunction
			extends PhabricatorPureChartFunction {

			const FUNCTIONKEY = 'cos';

			protected function newArguments() {
			return array();
			}

			public function evaluateFunction(array $xv) {
			$yv = array();

			foreach ($xv as $x) {
			$yv[] = cos(deg2rad($x));
			}

			return $yv;
			}

			}