Limits and derivatives
Connect an expression to what happens near an input, then connect a derivative to a rate of change. Explain the quantity and its units before calculating.
Explore limitsExplore limits, derivatives and their contextual applications, including graph analysis, optimization, signed accumulation, area and volume through complete explanations, labeled graphs, worked examples and original practice. Units 1–6 and Unit 8 are available; Unit 7 remains an outline.

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Connect average change, limits, continuity, asymptotes and the Intermediate Value Theorem through labeled graphs, tables, algebra and explanations. 48 original questions, 72 recall cards and 24 written challenges. Optional rotatable secant graph; complete 2D alternatives. Independent teacher review and student testing remain pending.
Build derivatives from limits, connect slopes to derivative graphs, test differentiability and apply fundamental rules. 42 explained original questions, 63 recall cards and 21 written challenges. Optional linked 3D graph planes with complete 2D alternatives. Independent teacher review and student testing remain pending.
Connect nested rates, differentiate implicit relations and inverses, choose derivative procedures and compute higher derivatives. 36 explained original questions, 54 recall cards and 18 written challenges. Optional 3D inverse-graph folding with complete 2D alternatives. Independent teacher review and student testing remain pending.
Interpret rates in context, connect motion quantities, solve related rates, estimate with tangent lines and apply L’Hôpital’s rule with its conditions. 36 explained original questions, 54 recall cards and 18 written challenges. Optional 3D conical-tank exploration with complete 2D alternatives. Independent teacher review and student testing remain pending.
Justify function behavior with theorems, signs and graphs; compare extrema; solve optimization problems; analyze implicit curves. 40 explained original questions, 60 recall cards and 20 written challenges. Optional 3D box-folding exploration with complete 2D alternatives. Independent teacher review and student testing remain pending.
Connect rates to signed accumulation, approximate with Riemann sums, apply the Fundamental Theorem and select AB integration methods. 42 explained original questions, 63 recall cards and 21 written challenges. Optional 3D tank exploration with complete 2D alternatives. Official topics 6.11–6.13 are BC-only and intentionally omitted. Independent teacher review and student testing remain pending.
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Connect integrals to average values, motion, stored amounts, areas and volumes. 40 explained original questions, 60 recall cards and 20 written challenges. Inspect square, rectangular, triangular and semicircular sections, disks and washers in optional 3D with complete 2D alternatives. AB topics 8.1–8.12; BC-only arc length is excluded. Independent teacher review and student testing remain pending.
College Board
Shared AB/BC CED plus Fall 2026 corrections; eight AB units.
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Connect an expression to what happens near an input, then connect a derivative to a rate of change. Explain the quantity and its units before calculating.
Explore limitsName what is accumulating and over which interval. Check the sign and units so a calculation answers the question that was asked.
Explore integrationCheck your exact course name and school placement requirements. BC includes additional topics; choose materials that match the course you are taking.
Explore the BC guideYes. The 142 available review-edition lessons are free to access. Units 1–6 and 8 have lessons; Unit 7 remains an outline. Independent teacher review and student usability testing remain pending. Tutoring is optional.
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