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

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 …

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 …

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

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.

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

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

The unit circle is used to help you find the exact values of trig functions of special angles (0°, 30°, 45°, 60°, 90° or their radian counterparts) and the multiples of those special angles.

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

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.