Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

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Characteristic Root Types Sprint

Distinct real roots, a repeated root, or a complex pair's envelope frequency -- solve a constant-coefficient equation's roots three ways, ninety seconds.

⏱️ 90s

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