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Prove and apply trigonometric identities.


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...

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