Whats Flash 8 equivalent to MX 2004's Math.easeinquad?

Found some code that I want to update to Flash 8 so I can use Flash’s filter’s too.

However, if I force fla to use Flash player 8 and AS 2.0 some of the code isnt recognized…namely:

Math.easeinquad

Is there somethign like this in Flash 8? Just tyring to find the way to convert this code over.