https://www.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:trig/x2ec2f6f830c9fb89:unit-circle/v/unit-circle-definition-of-trig-functions-1 2021-06-30T17:32:39Z Unit circle Learn how to use the unit circle to define sine, cosine, and tangent for all real numbers. Sal Khan video https://cdn.kastatic.org/googleusercontent/4va3CHgzmCX8w1NMhs0LlyYxLMiXHDwZ-dDm8quQ0X5OKdz1Yj1KGmmUatzGzQcx5s4jzRHet0bYdh0NK-KNxB3iTw Unit circle Learn how to use the unit circle to define sine, cosine, and tangent for all real numbers. https://cdn.kastatic.org/ka-youtube-converted/1m9p9iubMLU.mp4/1m9p9iubMLU.mp4 544 Sine and cosine function values https://www.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:trig/x2ec2f6f830c9fb89:unit-circle/e/unit-circle 2026-04-08T00:54:09.631945657Z Unit circle Practice your understanding of the unit circle definition of sine and cosine. Tomer Gal exercise https://www.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:trig/x2ec2f6f830c9fb89:radians/e/unit-circle-with-radians 2025-03-01T15:52:37.13987578Z Unit circle (with radians) Get more practice with the unit circle definition of sine and cosine, this time with radians instead of degrees. Tomer Gal exercise