<p>Most math and science study guides are a reflection of the college professors who write them-dry, difficult, and pretentious.</p> <p><i>The Humongous Book of Trigonometry Problems</i> is the exception. Author Mike Kelley has taken what appears to be a typical trigonometry workbook, chock full of solved problems — more than 750! — and made notes in the margins adding missing steps and simplifying concepts and solutions, so what would be baffling to students is made perfectly clear. No longer will befuddled students wonder where a particular answer came from or have to rely on trial and error to solve problems. And by learning how to interpret and solve problems as they are presented in a standard trigonometry course, students become fully prepared to solve those difficult, obscure problems that were never discussed in class but always seem to find their way onto exams.</p>