khanacademy.org
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Khan Academy is a free online learning platform offering high-quality video lessons and practice problems across math, science, and more. It provides a personalized learning dashboard with step-by-step solutions, quizzes, and mastery-based progress, including topics like differentiation and calculus.
More resources on Differentiation
Paul's Online Notes - Calculus II (Derivatives section with rigor)
Detailed notes on differentiation with proofs
Real Analysis
Learn differentiation in Real Analysis with Prof. Savage! This course covers key concepts and techniques with clear explanations.
Introduction to Real Analysis
Learn differentiation and more with this introductory Real Analysis course by Jeremy Orloff at MIT. Explore key concepts and build a strong foundation!
Introduction to Real Analysis
Coursera course: Introduction to Complex Analysis
mathworld.wolfram.com
MathWorld is Wolfram Research’s comprehensive online mathematics encyclopedia, featuring detailed articles with definitions, formulas, and explanations. Its differentiation content covers derivatives, differentiation rules (power, product, quotient, chain), higher-order derivatives, techniques, and practical applications with worked examples.
ocw.mit.edu
MIT OpenCourseWare is a free online repository of MIT course materials across disciplines. It provides lecture notes, assignments, exams, syllabi, and video resources for individual courses, including calculus and differentiation topics.