The Monthly Trigonometry Workbook is just a spiral curriculum dressed up in a calendar
Most people buying this thing expect magic. They get 30 days of problems and suddenly they understand radians. That does not happen. What actually happens is you slowly realize that trigonometry is not five different topics. It is one topic repeated at different angles, and the workbook forces you to see the repetition whether you want to or not. I picked up the Monthly Trigonometry Workbook because I was tutoring a student who could solve any right triangle problem in his sleep but fell apart the moment a non-right triangle showed up on a test. We started on day one of Month 2, which meant we had already pushed through basic SOH CAH TOA and gotten into Law of Sines territory. The structure is simple. Each week introduces a new concept, then the following weeks recycle it in slightly more complex forms. By the time you hit Law of Cosines in Week 3 of Month 2, you are still seeing Law of Sines problems tucked into the warm-up section. That recycling is the entire point.
How I actually use the Monthly Trigonometry Workbook in practice
The workbook has two columns on most pages. The left side is guided practice with a worked example followed by three or four similar problems. The right side is independent work. The guided section is decent but not great. It shows the first step correctly, then sometimes skips a minor algebraic manipulation that trips up slower students. I usually do the guided problems out loud with whoever is using it, filling in the steps the book leaves out. The real value is in the mixed review sections at the end of each week. Those pages pull from every topic covered that month. If you are doing Month 1, you are cycling through angle measurements, unit circle evaluations, basic graphing, and identities. The mixed sets force your brain to retrieve the right tool instead of just applying whatever you learned Tuesday. That retrieval practice is what actually sticks. I encountered a specific edge case last semester that the workbook does not address directly. A student was working through the inverse trig functions in Month 3, specifically arcsin and arccos, and kept getting answers that were numerically correct but in the wrong quadrant for the applied problem. The workbook gives the standard restriction diagrams for principal values but does not consistently tie those restrictions back to actual geometry problems where the angle lives outside the principal domain. I stopped using the workbook for that section and switched to having her draw reference triangles with labeled sides before evaluating any inverse function. She stopped making that mistake within two weeks. The workbook would have caught it eventually if she pushed through all 30 days, but the detour saved time.
What the workbook gets right that other resources miss
Most trigonometry practice books treat the unit circle and trig graphs as separate chapters. They do not do that. The monthly structure forces them together. By Month 3 you are looking at phase shifts and amplitude changes while simultaneously evaluating exact trig values from the unit circle. The connection is implicit but it is there. You start noticing that the period of tangent is pi for the same reason the x-coordinate repeats on the unit circle every pi rotation. Books that isolate topics delay that kind of insight. The identity section in Month 4 is also where I see the most differentiation. Instead of just listing Pythagorean identities and asking you to verify them, the workbook presents equations that require you to pick which identity path works. One problem asks you to simplify an expression involving secant and tangent. The intended path is dividing by cosine, but several students instinctively convert everything to sine and cosine first. The workbook does not comment on strategy, which is fine. It is your job to notice which path is shorter.
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Limitations and where the Monthly Trigonometry Workbook breaks down
It is not designed for advanced students. If you are already comfortable with trigonometric proofs or pre-calculus level material, you will find Months 1 through 3 slow. The problems are accessible, not challenging. There is maybe one per page that requires genuine thought. The rest are procedure drills. You can speed through those in half the time listed. The answer key is partial. Most odd-numbered problems have answers in the back. Even-numbered problems do not. This is a real bottleneck if you are self-studying. You cannot verify your work on half the problem set without seeking help elsewhere. I keep a separate resource open for the even problems, usually a free online solver or a YouTube walkthrough for the specific problem type. The workbook also assumes comfort with algebra II level manipulation. Factoring quadratics, solving rational equations, and working with exponents are all expected prerequisites. I had a student who stalled in Month 2 for three weeks because she could not factor a quadratic that appeared inside a trig equation. The workbook does not review algebra. If your algebra is weak, you will spend more time untangling equations than learning trigonometry.
There is also no digital component. The PDF version is print-ready, not interactive. You write your work on paper or in a notebook. If you need to check answers immediately or track progress digitally, this is not the tool. I recommend using it alongside a simple spreadsheet where you log which problems you missed and revisit them in the next month cycle. That takes about ten minutes per session but makes the spiral review actually effective instead of accidental. For students preparing for AP Trig or standardized tests, this workbook covers the material but does not match the difficulty of the exam. The AP exam includes more multi-step problems that combine topics in ways this workbook rarely does. I pair it with past AP free response questions for the final two weeks of use. The workbook builds the foundation. The exam problems teach you how to use it under pressure.
