Use special triangles to determine geometrically the values of sine, cosine, tangent for π/3, π/4 and π/6, and use the unit circle to express the values of sine, cosine, and tangent for π – 𝘹, π + 𝘹, and 2π – 𝘹 in terms of their values for 𝘹, where 𝘹 is any real number.

Functions

Trigonometric Functions

Extend the domain of trigonometric functions using the unit circle.