Reflection: Intervention and Extension Sum and Difference Identities - Section 2: Explanation


Todays’ lesson was very teacher driven. When students struggled, it was only for a short time. When I modeled problems, I found that this provided appropriate scaffolding for this lesson. One challenging issue was helping students to recall the rules for radical operations. I  like to relate this back to basic algebra for the kids. Reminding them about how we can’t add terms that are not alike. So, therefore we can’t add radicals that are not alike. Today I also found that some of my students needed to be reminded about rules for adding and subtracting fractions.

  Overcoming Gaps in Understanding
  Intervention and Extension: Overcoming Gaps in Understanding
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Sum and Difference Identities

Unit 9: Trigonometric Equations
Lesson 13 of 16

Objective: SWBAT apply the sum and difference identities to find the exact values of trigonometric ratios of angles that are not derived from special triangles.

Big Idea: The love story of Sinbad and Cosette helps students to remember and apply the sum and difference identities.

  Print Lesson
Math, Precalculus and Calculus, Trigonometry, PreCalculus, sum and difference formula, Trigonometric identities, Pythagorean Identity, 12th Grade
  55 minutes
sum and difference identities resized
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