Which of these mathematics-focused e-commerce platforms was originally founded by a former hedge fund analyst and initially offered only video tutorials of calculus problems?

The intersection of mathematics and e-commerce has produced some fascinating platforms specifically designed for mathematics education and tools. These platforms have revolutionized how mathematical concepts are taught, learned, and applied in academic and professional settings. Test your knowledge about these specialized mathematics e-commerce platforms that have changed the educational landscape!

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Khan Academy
Wolfram Alpha
Brilliant.org
Desmos