Geometry problem with a limit: Given a parallelogram ABCD with sides AB = 2a, AD = a.

[aeros]

I'd desperately need help for this problem: it is given a parallelogram ABCD of sides AB = 2a and AD = a. Now consider the point P, obtained intersecting the circumference whose radius is AC and center A, and the extension of AB on B's side. Calculate the limit of the fraction (CA^(2)-9AD)/(AD^(2)-DB^(2)) as the point C approaches P.
Thank you!

 

[blamocur]

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