Trigonometric Identity Proofs

Proving a trig identity might just be easier than proving your own identity at the airport. Learners first investigate a table of values to determine and prove the addition formulas for sine and cosine. They then use this result to develop the subtraction formulas.

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CCSS: Designed
Instructional Ideas

  • Use the resource to introduce addition and subtraction formulas for sine and cosine
Classroom Considerations

  • Learners need to have graphing calculators available
  • Note that some portions of the lesson are likely to take more than the indicated time allotment
  • The 18th installment of a 19-part series

  • Resource indicates where to look for mathematical practices
  • Proofs have scaffolding with fill-in-the-blank statements

  • None
Common Core