# HSF-TF.C

Prove and apply trigonometric identities.

## Standards

HSF‑TF.C.8
Prove the Pythagorean identity $\sin^2(\theta) + \cos^2(\theta) = 1$ and use it to find $\sin(\...

HSF‑TF.C.9
$(+)$Prove the addition and subtraction formulas for sine, cosine, and tangent and use them to...

## Tasks aligned to this cluster

Coordinates of Points on a Circle