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lesson 3
1 hour

Addition and Subtraction Formulas


Description

Students prove the subtraction formula for cosine, using their understanding of the trigonometric-functions to derive the remaining addition/subtraction-formulas for the sine, cosine, and tangent-functions.

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Credits

From EngageNY.org of the New York State Education Department. Precalculus and Advanced Topics Module 4, Topic A, Lesson 3. Available from engageny.org/resource/precalculus-and-advanced-topics-module-4-topic-a-lesson-3; accessed 2015-05-29.
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