https://www.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:trig/x2ec2f6f830c9fb89:unit-circle/v/unit-circle-definition-of-trig-functions-1
Learn how to use the unit circle to define sine, cosine, and tangent for all real numbers.
https://www.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:trig/x2ec2f6f830c9fb89:unit-circle/e/unit-circle
Practice your understanding of the unit circle definition of sine and cosine.
https://www.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:trig/x2ec2f6f830c9fb89:unit-circle/a/trig-unit-circle-review
Review the unit circle definition of the trigonometric functions.
https://www.khanacademy.org/math/trigonometry
Explore the world of trigonometry by mastering right triangles and their applications, understanding and graphing trig functions, solving problems involving non-right triangles, an
https://www.khanacademy.org/math/geometry/hs-geo-circles
Explore geometry concepts related to circles, including properties, formulas, and applications, through engaging lessons and exercises on Khan Academy.
https://www.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:trig/x2ec2f6f830c9fb89:special-angles/v/solving-triangle-unit-circle
Learn about solving triangles on the unit circle with Khan Academy's Algebra 2 lessons, focusing on trigonometry and special angles.
https://www.khanacademy.org/math/trigonometry/unit-circle-trig-func/unit-circle-definition-of-trig-functions/v/matching-ratios-trig-functions
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 rig
https://www.khanacademy.org/math/geometry-home/trigonometry/unit-circle-trig-func
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 invol
https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:trig/x9e81a4f98389efdf:trig-id/v/tan-symmetries-unit-circle
Sal finds several trigonometric identities for tangent by considering horizontal and vertical symmetries of the unit circle.
https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:trig/x9e81a4f98389efdf:special-trigonometric-values-in-the-first-quadrant/v/cosine-sine-and-tangent-of-6-and-3
With the unit circle and the Pythagorean theorem, we can find the exact sine, cosine, and tangent of the angles π/6 and π/3.