Where does the unit circle come from? How do we graph all the trig functions? Where do the trigonometric identities come from? Join this series to explore all the questions previously mentioned and more. Whether you want to learn, review, or master these topics, the series is perfect for you. We will cover all the topics in the trigonometry unit for precalculus on Khan Academy. You look over these here: https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:trig

Join this series to learn about arithmetic and geometric series. During this series, we will learn about expressing and evaluating series with summation notation. We will go through all the material covered in the Khan Academy Precalculus unit for Series. If you are interested in not just learning how to solve these types of problems, but why the solutions and formulas work, this is the perfect series for you. Our goal is to achieve complete mastery of the topic through review sessions and guided practice. Feel free to look at the Khan Academy unit here: https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:series