In the previous lesson, students applied an analytic method to prove the subtraction formula for cosine. They then derived the remaining addition and subtraction formulas using their understanding of the periodicity and symmetry of the sine, cosine, and tangent functions.
In this lesson, students continue to apply their understanding of the properties of the trigonometric functions to determine double and half-angle formulas for sine, cosine, and tangent, which they apply to evaluate trigonometric functions for specific input values.
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