Prove and apply trigonometric identities
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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.
Prove the addition and subtraction formulas for sine, cosine, and tangent and use them to solve problems.
Apply trigonometric identities.