Symmetry of easeIn and easeOut functions

by 9re forked from Easing function (diff: 10)
♥0 | Line 0 | Modified 2009-06-23 12:31:14 | MIT License
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ActionScript3 source code

/**
 * Copyright 9re ( http://wonderfl.net/user/9re )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/o2NG
 */