Final answer:
Trigonometric identities can be used to solve problems related to the unit circle, including negative and over 2π radians. The unit circle is a circle with a radius of 1 unit, centered at the origin (0,0) in a coordinate plane. Understanding the periodicity of trigonometric functions is essential for finding the values of these functions for angles beyond 2π radians.
Step-by-step explanation:
Trigonometric identities can be used to solve problems related to the unit circle. The unit circle is a circle with a radius of 1 unit, centered at the origin (0,0) in a coordinate plane. It is used in trigonometry to define the values of sine, cosine, and tangent for different angles. When dealing with negative and over 2π radians in the unit circle, we can use the periodicity of trigonometric functions to find the values of the functions for those angles.