Mary Jane Sterling is also the author of Algebra I For Dummies, Algebra II For Dummies, Math Word Problems For Dummies, Business Math For Dummies, and Linear Algebra For Dummies. She taught junior high school and high school math for several years before beginning her current 30-plus-year tenure at Bradley University in Peoria, Illinois. Mary Jane especially enjoys working with future teachers and trying out new technology. She and her husband, Ted, are enjoying their time with children, grandchildren, and fishing (not necessarily in that order).
I would like to dedicate Trigonometry For Dummies to the Kiwanis Club of Peoria (Downtown). Working with this club over the past 20 years has allowed me to have wonderful interactions with members and participate in projects with the area Aktion Clubs (for special-needs adults), Bradley Circle K (college service organization), and Key Clubs (high school groups). The friendships and fellowship have enriched my life immensely, just as the club’s service has enriched the community.
I give a huge thank-you to my project editor, Elizabeth Kuball, who has agreed, yet again, to take on a challenging mathematics book. Elizabeth is always so efficient yet understanding, professional yet forgiving, and a peach to work with under pressure.
Thank you to my technical editor, Shira Fass. As careful as I try to be, I still seem to miss one thing or another. Thank you for catching any silly (or not ...