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  1. Precalculus 2e - OpenStax

  2. Pearson Precalculus, 11th Edition : Sullivan & Sullivan : Free …

  3. Precalculus: An Investigation of Functions - Open Textbook Library

  4. Precalculus - Open Textbook Library

  5. Precalculus - Khan Academy

  6. Precalculus - OpenTextBookStore

  7. Precalculus - OpenStax

  8. Ch. 1 Introduction to Functions - Precalculus 2e | OpenStax

  9. Precalculus - Open Textbook Library