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December 20, 2014

December 20, 2014

Posted by **luz** on Wednesday, March 27, 2013 at 12:52am.

-4x^2 + 4y^2

- math -
**Steve**, Wednesday, March 27, 2013 at 10:36amlooks like one to me.

(2y)^2 - (2x)^2

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