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 sin²(θ) + cos²(θ) = 1, and use it to find sin(θ), cos(θ), or tan(θ) given sin(θ), cos(θ), or tan(θ) and the quadrant of the angle.
Apply trigonometric identities.
Prove and apply trigonometric identities