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Chalk Dust Company
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16107 Kensington Dr
Sugar Land, TX 77479-4401

800.588.7564 (USA)
281.265.2495
281.265.3197 fax

sales@chalkdust.com

Trigonometry
Trig
Reviews of
Trigonometry

"Dear Dana,

I am active duty Air Force and a deployed student enrolled at Embry-Riddle. I just completed my first online course using your DVD based lecture for College Trigonometry. At first I thought that I would struggle not having direct one-on-one communication with my instructor. That has certainly not been the case.

I sought out your name and email address because I had to let you know what a joy it has been learning from your lectures. I do not exaggerate when I say I struggled in my academic level math courses in high school. During the couple of college math classes I have taken I also had some difficulty fully grasping some concepts. I never thought that a pre-recorded lecture would blow away any experience I would have any a regular classroom. You have been the best math teacher I have ever had bar none. I never have any questions because you explain it all and in such an enthusiastic, attention grabbing way!

I could honestly go on and on with compliments for your teaching methods and personality. I just wanted to say thank you for a great experience.

Best regards,

JONATHAN HARMON, Ssgt, USAF
Beale AFB, CA"


Trigonometry 7th Edition (2007) Review by Cathy Duffy

9 DVDs, hardbound textbook, student solutions guide, and student technical support - $429

The text for this course is Trigonometry, 7th Edition, by Larson and Hostetler. This is a traditional course covering both trigonometry and some analytic geometry. Graphing calculators are referenced throughout the text and demonstrated throughout the video as well. Although these calculators can be somewhat expensive, they can be critical in demonstrating equations and the relationship between the algebraic form (the equation) and the geometric form (the graph). The TI-83 Plus is recommended.

If students are not already familiar with the calculator, they should go through the user-friendly instructions that come with it and learn the calculator techniques on a need-to-know basis as they are encountered during the course.

The solutions guide is a student edition with complete solutions shown for only odd problems from student exercises. All test solutions are shown. (Note: Precalculus covers the content of Trigonometry and College Algebra so students need not do either of those courses in addition to Precalculus.)


Trigonometry is a set of 10 videotapes that cover all of a typical high-school trig course. Assuming the classroom teacher makes it all the way through the book--most don't. The courde is subtitled "A Graphing Approach" and you can purchase an optional reference text by that name, e.g., Trigonometry: A Graphing Approach, written by Larson, Hostetler, and Edwards, and published by D.C. Heath. Your video instructor is Dana Mosely, a man with over 15 years classroom teaching experience and 8 years' experience as D.C. Heath's video instructor in mathematics. As always, he divides his time between addressing you directly and drawing on and pointing to the blackboard. When possible, grids are prepared in advance, so no time is wasted watching him set up the black board. Mr. Mosely's sine curves are just as beautiful as his straight lines--unlike other instructors, his blackboard work is a joy to watch. He also is clearly comfortable with the topic, to the point of calling sine function values "these rascals here." No stuffy, unintelligible mystique here!

The tapes on this trig course are mostly longer than those in other Chalk Dust courses. Tape 1, "Prerequisites," is almost 4 hours long. It goes from a lecture on the real number system, through graphing in the Cartesian plane, to inverse functions. Tape 2 is a whopping 4 hours and 26 minutes, and covers measurements in radians and degrees, basic trig functions as they relate to unit circles/right triangles/any angle, graphing trig functions and inverse trig functions, and trig applications. The remaining videotapes cover "additional topics in trigonometry," complex numbers, exponential and logarithmic functions, and topics in analytic geometry. This is where you get into the fun stuff, such as parabolas, ellipses, hyperbolas, and polar coordinates.

As you may have surmised, to many students, trig is deadly stuff. Only future engineers and scientists really enjoy trig, or even half-understand it at the pace it's presented in class. These videos, each tape of which corresponds to a chapter in the reference text, are just the help a struggling trig student can use.

Mary Pride

Chalk Dust Trigonometry covers all of a typical high-school or college trig course. (Assuming the classroom teacher makes it all the way through the book—most don't.) The course is subtitled "A Graphing Approach" (meaning you get to experience the horror of a graphing calculator), and you can purchase (which I strongly recommend) an optional reference text by that name, e.g., Trigonometry: A Graphing Approach, written by Larson, Hostetler, and Edwards. The tapes on this trig course are mostly mostly longer than those in other Chalk Dust courses. Tape 1, "Prerequisites," is almost 4 hours long. It goes from a lecture on the real number system, through graphing in the Cartesian plane, to inverse functions. Tape 2 is a whopping 4 hours and 26 minutes, and covers measurements in radians and degrees, basic trig functions as they relate to unit circles/right triangles/any angle, graphing trig functions and inverse trig functions, and trig applications. The remaining videotapes cover "additional topics in trigonometry," complex numbers, exponential and logarithmic functions, and topics in analytic geometry. This is where you get into the fun stuff, such as parabolas, ellipses, hyperbolas, and polar coordinates.

Mary Pride


"Our daughter is 16, and is dual enrolled at the local Jr. College. She made D's on her first two tests in the Trig portion (of her course). She went to her professor...The professor recommended a tutor or possibly the videos that went along with the text. She immediately checked out the videos from the college library, and to our surprise, Dana was the instructor. She began watching the videos beginning with the section where she began having trouble. She spent the entire weekend watching the videos and catching up to where she was in the class. She made a 92% on her next test. Needless to say she used your videos for the remainder of the class and continued to make A's on her tests. We are all very grateful for your math videos. I recommend them to everyone I know that has children in higher math."

Renee Ambrose, April 2000

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