Prove and apply trigonometric identities.
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Prove the addition and subtraction formulas for sine, cosine, and tangent and use them to solve problems.
Prove the Pythagorean identity (sin 𝐴)² + (cos 𝐴)² = 1 and use it to find sin 𝐴, cos 𝐴, or tan 𝐴, given sin 𝐴, cos 𝐴, or tan 𝐴, and the quadrant of the angle.
Apply trigonometric identities.
Prove and apply trigonometric identities