Which mathematical product development innovation first successfully incorporated adaptive learning algorithms that could personalize difficulty based on individual student performance in real-time?

The educational mathematics market has seen significant evolution in product development strategies over the past decade. Companies creating mathematics learning tools must balance educational efficacy with market appeal. This poll tests your knowledge about a significant product development breakthrough in mathematics education technology that changed how students interact with complex concepts.

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Wolfram Alpha (2009)
ALEKS (Assessment and Learning in Knowledge Spaces) by McGraw-Hill (1994)
Desmos Graphing Calculator (2011)
Khan Academy's Knowledge Map (2010)