**Open Trigonometry: Basic to Advanced**

**Publisher**: Wikibooks 2014**Number of pages**: 51

**Description**:

Book 1 is pre-calculus trigonometry. We assume the student is relatively new to algebra and do algebra step by step. Many of the pages have closely related free/YouTube videos at the Khan Academy. This is by design. Many students find the video presentation helpful with learning mathematical material.

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