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class com.robertpenner.easing.Cubic {
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static function easeIn (t:Number, b:Number, c:Number, d:Number):Number {
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return c*(t/=d)*t*t + b;
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static function easeOut (t:Number, b:Number, c:Number, d:Number):Number {
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return c*((t=t/d-1)*t*t + 1) + b;
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static function easeInOut (t:Number, b:Number, c:Number, d:Number):Number {
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if ((t/=d/2) < 1) return c/2*t*t*t + b;
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return c/2*((t-=2)*t*t + 2) + b;