- 3Blue1Brown: Why Pi: https://www.3blue1brown.com/topics/why-pi
- 3Blue1Brown Logarithms: https://itempool.com/3b1b/c/6XOc6exC7am and https://itempool.com/3b1b/c/uByeGoOoUqV
- Princeton's Companion to Mathematics - Some initial topics
- Concrete Mathematics: Graham, Knuth, and Patashnik.
- Probability a. https://www.3blue1brown.com/topics/probability
- Linear Algebra by Gilbert Strang: https://ocw.mit.edu/courses/18-06-linear-algebra-spring-2010/video_galleries/video-lectures/
- 3Blue1Brown: https://www.3blue1brown.com/topics/linear-algebra
- No Bullshit Guide to Linear Algebra
- Trignometry and Trignometric Identities
- 3Blue1Brown Trignometry Fundamentals: https://itempool.com/3b1b/c/XYq2wSLpFf5
- Plane Trignometry - Loney (very old book).
- Complex Numbers
- 3Blue1Brown Complex Numbers Fundamentals: https://itempool.com/3b1b/c/osSo1bARsZM
- Euler's Formula: https://itempool.com/3b1b/c/Q9Knk-DJta8
- Geometry of Complex Numbers
. Linear-Algebra
Topics: Limits and Continuity, The Derivative, 6 functions, rules and theorems, The Integration, The fundamental theorem of Calculus, Infinity, Series, Multivariable Calculus, Differential Equations
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3Blue1Brown Essence of Calculus: https://www.3blue1brown.com/topics/calculus
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Gilbert Strang: Highlights of Calculus: https://ocw.mit.edu/courses/res-18-005-highlights-of-calculus-spring-2010/video_galleries/highlights_of_calculus/
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Gilbert Strang Derivatives: https://ocw.mit.edu/courses/res-18-005-highlights-of-calculus-spring-2010/video_galleries/derivatives/
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3Blue1Brown Differential Equations: https://www.3blue1brown.com/topics/differential-equations
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Multivariable Calculus (Grant Sanderson - 3Blue1Brown): https://www.khanacademy.org/math/multivariable-calculus/thinking-about-multivariable-function#introduction-to-multivariable-calculus
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Excellent Books:
a. Calculus Made Easy - Thompson
b. Calculus by Spivak
c. Calculus by Gilbert Strang
d. All the mathematics you missed [But need to know for graduate school] by Thomas Garrity
e. Elementary Differential Equations and Boundary Value Problems by Boyce et. al.,