| Harold's Cheat Sheets | ||
| Harold's Trigonometry Parent Functions Cheat Sheet | Docx | My parent functions and their inverses for trigonometry and hyperbolics. Also called Library of Functions. |
| Harold's Illegals Cheat Sheet | Docx | My list of common illegal (undefined) math operations |
| Harold's Graphing Rationals Cheat Sheet | Docx | My tips on graphing rational polynomial functions P(x)/Q(x) |
| Harold's Exponential Growth and Decay Cheat Sheet | Docx | My natural growth and decay formulas used in finance, radioactive decay half-lifes, and biology bacteria growth |
| Harold's Trigonometry Cheat Sheet | Docx | My trig supplement to Paul's Online Notes |
| Harold's Triangles Cheat Sheet | Docx | Law of Sines, Cosines, and Tangents |
| Harold's Trig Proofs Cheat Sheet | Docx | My proofs of three (3) trig formulas that allow us to easily derive ALL of the other trig formulas |
| Harold's Partial Fraction Expansion (Precalculus) Cheat Sheet | Docx | My partial fraction expansion tips with a Precalculus example |
| Harold's Vectors Cheat Sheet | Docx | My vector formulas with illustrations and examples |
| Harold's Polar Parent Functions Cheat Sheet | Docx | My parent functions for polar coordinates. Also called Library of Functions. |
| Harold's Matrix Cheat Sheet | Docx | My matrix formulas with illustrations and examples |
| Harold's Series Cheat Sheet | Docx | My arithmentic and geometric series, permutations, and combinations formulas |
| Harold's Precalculus Cheat Sheet | Docx | My rectangular, polar, and parametric coordinate equations for conics sections |
| Harold's Finances Cheat Sheet | Docx | My basic financial equations for compounded interest and computing loan payments. See also Math and Money Fun for Students. |
| Harold's Hyperbolics Cheat Sheet | Docx | My formulas for hyperbolic functions for precalcuolus through calculus |
| Harold's TI-84 Grid for Parametric Art | Docx | My template for creating parametric art on a TI-84 calculator |
| Harold's Math Etiquette Cheat Sheet | Docx | Lists bad math etiquette, illegal math operations, and how to polish your work. |
| Paul's Online Math Notes | ||
| Trig Cheat Sheet - Full | Fits on four pages (source link) (Texas: Math 2412) | |
| Trig Cheat Sheet - Reduced | Fits on one page (2 pages per side) (source link) (Texas: Math 2412) | |
| Algebra & Trig Review | Review for Calculus 1 students (source link) (Texas: Math 2412) | |
| Complex Number Primer | Common complex number concepts (source link) (Texas: Math 2412) | |
| BarCharts QuickStudy Guide | ||
| Precalculus | ||
| Textbooks | Link | Free Open-Source Textbooks |
| Precalculus | Link | OpenStax free open-source textbook - Precalculus |
| Algebra and Trigonometry | Link | OpenStax free open-source textbook - Algebra and Trigonometry |
| Books | ||
| Schaum's Outline - Precalculus | Schaum's Outline of Precalculus, 2nd Edition (2008) | |
| Precalculus: Graphical, Numerical, Algebraic | Franklin Demana, Bert K. Waits, Gregory D. Foley and Daniel Kennedy, 7th Edition (2006) | |
| AP | Advanced Placement (AP) | |
| AP Practice Exams - Precalculus | College Board - precalculus Link (new 2024) | |
| AP Practice Exams - Precalculus - 2024 - 2024 ZIP File | College Board - AP Precalculus Exams(2024-2024) ZIP File (1 MB) | |
| Links | ||
| WolframAlpha.com | Computational Knowledge Engine | |
| Wikipedia.org | The Free Encyclopedia that anyone can edit | |
| Conic Secions | Determining Conic Sections by Inspection | |
| Partial Fractions | Wikipedia article explaining partial fraction expansion | |
| Calculator Tutorials for the TI-83/TI-84 | Calculator Tutorials for the TI-83/TI-84 by John LaPrise | |
| Desmos Graphing Calculator | Free Web-based graphing calculator | |
| Trigonometry - Unit Circles | Trigonometry of unit circles along with the best unit circle chart | |
| iPad Apps | Apple's App Store | |
| Graphing Calculator | Best Graphing Calculator | |
| WolframAlpha | The Google of Mathematics | |
| Math Ref | Best list of Math, Physics, and Chemistry Formulas | |
| Formulas - Formulas for Calculus | More Formulas | |
| PCalc | Best Calculator | |
| Symbolic Calculator HD | Symbolic Calculator (CAS) | |
| PocketCAS Pro | Symbolic Calculator (CAS) | |
| SpaceTime | Graphing | |
| Pi Cubed | Calculator |
Samples of my student's parametric art on a TI-84 calculator.
| Parametric Art Hall of Fame | Date | Photo |
| Ryan - TI-84 Art - Futurama | May 2012 |  |
| Jessica - TI-84 Art - Donald Duck | May 2011 |  |
| Lauren - TI-84 Art - Mini Mouse | May 2011 |  |
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Last updated 5 May 2025