https://es-cl.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:trig 2025-11-20T17:56:31.732617198Z Trigonometry Let's extend trigonometric ratios sine, cosine, and tangent into functions that are defined for all real numbers. You might be surprised at how we can use the behavior of those functions to model real-world situations involving carnival rides and planetary distances. unit