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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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Integration Readiness Sprint

$u$-substitution, FTC Part 2, a Riemann sum, L'Hopital's rule — the toolkit this course is about to lean on.

⏱️ 90s
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