Which mathematical software product was the first to introduce a natural 'what-you-see-is-what-you-get' (WYSIWYG) interface for typing complex mathematical equations and was later acquired by Microsoft?

The world of mathematics education and research has been transformed by specialized software tools over the decades. These products have changed how mathematical concepts are taught, visualized, and applied across industries. This trivia question explores a pivotal moment in mathematical software product development that revolutionized how we interact with mathematical formulas and calculations.

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Mathcad
Mathematica
MATLAB
Maple