Play with the point on the unit circle to see how cosine and secant change together. Notice how when cosine is small, secant is big, and vice versa. It turns out they always multiply to exactly 1 ‍ .

Learn how to use the unit circle to define sine, cosine, and tangent for all real numbers. Created by Sal Khan.

Discover how to measure angles, distances, and heights using trigonometric ratios and the unit circle. Learn how to use sine, cosine, and tangent to solve real-world problems involving …

The unit circle can be seen as an extension or generalization of SOHCAHTOA, as it provides a broader and more comprehensive understanding of trigonometric functions beyond just right …

Unit 14: Circles About this unit Explore, prove, and apply important properties of circles that have to do with things like arc length, radians, inscribed angles, and tangents.

What is the unit circle definition of the trigonometric functions? The unit circle definition allows us to extend the domain of sine and cosine to all real numbers.

Sal finds trigonometric identities for sine and cosine by considering angle rotations on the unit circle.

Learn how to use the unit circle to define sine, cosine, and tangent for all real numbers. Created by Sal Khan.

Sal finds several trigonometric identities for sine and cosine by considering horizontal and vertical symmetries of the unit circle.

Sal draws the graph of the tangent function based on the unit circle definition of the function.