Precalculus 3: trigonometry
A total of 52 hours of lectures
Due to the size of precalculus, it is divided into four parts. This page describes the third of those four parts.
Prerequisites
 Highschool mathematics, mainly arithmetic; solving simple equations (linear and quadratic) with one unknown; some (but very few) polynomial equations will be solved during the course, but you can skip them if you want to (no problem at all; it will not affect your understanding of trigonometry).
 Precalculus 1: Basic notions (mainly the concept of function and related concepts; sets; logic)

You will get a very brief introduction to *complex numbers* in this course, just enough for presenting one of applications of trigonometry, and for a nice illustration of the formulas for sine and cosine of a sum

Some basic geometry (angles, triangles, polygons); a crash course (6 hours) is provided in Section 2 of this course (can be skipped if you feel that you master basics of geometry)
Curriculum
Make sure that you check with your professor what parts of the course you will need for your exam. Such things vary from country to country, from university to university, and they can even vary from year to year at the same university.
Precalculus 3: trigonometry
Get the outline
A detailed list of all the lectures in part 3 of the course, including which theorems will be discussed and which problems will be solved. If you are looking for a particular kind of problem or a particular concept, this is where you should look first.
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This instructor is extremely organized! All lessons are built up incrementally without overwhelming. I can go thru the lessons without worrying about forgetting stuff from previous lessons because the instructor would add reminders in the video referencing the previous lessons or other courses. Math is usually dry from other teachers but I really enjoy this instructor’s materials. I watch the videos at 1.5x or 2x speed and the voice!is still clear. Highly recommended!