eTextbook of "Precalculus: A Right Triangle Approach" by J. A. Beecher, J. A. Penna and M. L. Bittinger (c2012). Small bookmarked PDF file (15 MB) complete with table of contents and index.
For overview, features and table of contents: http://www.pearsonhighered.com/educator/product/9780321693976.page
Comment: Emphasis on visual communication for quick, efficient and sustainable learning.
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