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2016-03-07:
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Typo: Section 4.3, in Example 4.13 corrected the smaller radius to be 4cm in the statement to match the drawing and solution. (Y. Li)
Typo: Section 5.1, corrected the statement cot x = 1/tan x above Example 5.1. (Y. Li)
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2015-07-19:
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Typo: Section 1.4, in Example 1.21 corrected the hypotenuse length in the drawing.
Update: Section 2.4, updated footnote 9 with a new link to Goldberg's paper.
Typo: Section 3.2, changed "+" to "-" in equation above equation (3.15). (S. Braver)
Typo: Section 3.4, in Example 3.22 corrected the reference to formula (3.39) instead of (3.43).
Modification: Section 4.1, included Matlab with Octave in footnote 3.
Modification: Section 6.4, simplified the wording at the end of Example 6.18. (S. Braver)
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2013-06-03:
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Typo: Section 6.3, corrected "real part" to "imaginary part" at end of first paragraph. (T. Hess)
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2012-06-14:
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New: Version 1.2 is released.
Update: Re-licensed under version 1.3 of the GNU Free Documentation License.
Update: Appendix B, updated Gnuplot tutorial for version 4.6.0, used monospaced font for Gnuplot commands.
Modification: Section 1.1, in Exercise 13 clarified the definition of a Pythagorean triple (S. Braver).
Modification: Section 1.3, removed the sin^2 and cot^2 notation from Example 1.18 and Exercises 5 and 12 since those aren't formally introduced until Chapter 3. (S. Braver)
Typo: Section 1.4, in Table 1.3 flipped the negative sign from secant to cosecant for 330 degrees. (S. Braver)
Typo: Section 3.4, in Exercise 14 corrected the hint (S. Braver).
Modification: Section 4.2, moved the hint from Exercise 8 (where it was unnecessary) to Exercise 9. (S. Braver)
Typo: Section 5.3, in Example 5.20 inserted missing square root symbols. (S. Braver)
Modification: Section 6.1, reworded the last paragraph before Example 6.1 about the use of k notation. (S. Braver)
Modification: Section 6.2, show Python code in the interactive plain python shell instead of ipython.
Modification: Section 6.2, put Octave, Python, and Sage code in framed boxes.
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2011-08-13:
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Internal: Removed dependence on unnecessary packages in LaTeX.
Internal: Replaced bbding, dingbat and wasysym packages by pifont package.
Internal: Gnuplot-generated graphics now use the epslatex terminal for consistent fonts.
Internal: Changed the sans serif font from the deprecated URW Gothic to Helvetica.
Update: Appendix B, updated graphics and Gnuplot tutorial with the new printing procedure in Windows.
Typo: Section 2.4, corrected a typo in the statement of Heron's formula (Y. Ng).
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2010-11-26:
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Typo: Appendix A, used correct signs in the answer to Exercise 23 from Section 1.4. (D. Brock)
Typo: Appendix A, eliminated extra unit in the answer to Exercise 7 from Section 4.4. (D. Brock)
Typo: Appendix A, corrected the answers to Exercises 17 and 19 from Section 5.3. (D. Brock)
Typo: Section 6.3, added brackets in the statements of Exercises 33 and 34. (D. Brock)
Typo: Appendix A, corrected the answer to Exercise 9 from Section 6.4. (D. Brock)
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2010-09-23:
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Internal: Fixed issues with bad pagebreaks and Dingbat font symbols not displaying properly using new LaTeX packages.
Typo: Appendix A, changed c to b in the answer to Exercise 23 from Section 1.3. (L. Bader)
Typo: Appendix A, used correct units in the answer to Exercise 29 from Section 1.3. (D. Brock)
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2010-09-10:
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Internal: Fixed a few color and spacing issues caused by upgrade to new LaTeX packages and new Ghostscript version.
Typo: Appendix A, removed unnecessary semicolon from answer to Exercise 21 from Section 1.2. (C. Seberino)
Typo: Appendix A, the answers to Exercises 4 and 5 from Section 3.2 were given as those for Exercises 5 and 6. (C. Seberino)
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2010-05-06:
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Typo: Example 5.8, fixed the scale on the y-axis in Figure 5.2.6.
Typo: Example 5.10, fixed the last sentence.
Typo: Appendix A, added a degrees symbol after the value of angle A in the answer to Exercise 1 from Section 2.3.
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2010-03-12:
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New: Version 1.1 is released.
New: New section (6.4) on Polar Coordinates.
New: Added a short Sage example at the end of Section 6.2.
New: New format for examples and page headers.
Typo: Section 2.2, corrected the statement of Exercise 17.
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2009-12-16:
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New: Expanded the hint to Exercise 10 in Section 3.4.
Typo: Example 4.4, corrected "convert theta = 40" to "convert theta = 41". (Se. Tarpinian)
Typo: Example 4.13, corrected "alpha = 0.775 rad" to "beta = 0.775 rad". (D. Billington)
Typo: Appendix A, corrected the answers to Exercises 3 and 5 from Section 4.4. (S. Halas)
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2009-11-23:
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Typo: Appendix A, corrected the answer to Exercise 5 from Section 4.2. (K. Kachin)
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2009-11-11:
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Typo: Section 3.3, corrected the denominator in Exercise 6. (Sa. Tarpinian)
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2009-10-12:
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Typo: Example 1.25, fixed the caption in Figure 1.4.8b.
Typo: Example 1.26, fixed a double word "plane plane". (M. Brey)
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2009-09-23:
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Typo: Section 1.4, fixed a broken page reference in the exercises. (M. Khoury)
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2009-08-29:
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Initial version 1.0 is released.