An object with a, b, c, and d properties representing the starting anchor value (a), first control point (b), second control point (c), and ending anchor value (d) of a Cubic Bezier matching the Quadratic Bezier data passed in.
GreenSock Docs (HTML5/JS)
BezierPlugin.quadraticToCubic()
BezierPlugin.quadraticToCubic( a:Number, b:Number, c:Number ) : Object
[static] Returns the Cubic equivalent of a Quadratic Bezier.
Parameters
a: Number
The starting anchor value
b: Number
The control point value
c: Number
The ending anchor value
Returns : Object

Details
Returns the Cubic equivalent of a Quadratic Bezier. This method returns an object with a, b, c, and d properties representing the starting anchor value (a), first control point (b), second control point (c), and ending anchor value (d) of a Cubic Bezier matching the Quadratic Bezier data passed in.