# HSF-TF.A

Extend the domain of trigonometric functions using the unit circle.

## Standards

HSF‑TF.A.1 Understand radian measure of an angle as the length of the arc on the unit circle subtended by...
HSF‑TF.A.2 Explain how the unit circle in the coordinate plane enables the extension of trigonometric...
HSF‑TF.A.3 $(+)$Use special triangles to determine geometrically the values of sine, cosine, tangent for $\... HSF‑TF.A.4$(+)\$Use the unit circle to explain symmetry (odd and even) and periodicity of trigonometric...

## Tasks aligned to this cluster

Exploring Sinusoidal Functions