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Does cos(A - B) = cos(A) - cos(B)?

Unit 5: Trigonometric Relationships
Lesson 4 of 15

Objective: SWBAT use the sum and difference formulas for sine, cosine, and tangent.

Big Idea: Students disprove a potential identity and then derive the real cos(A - B) formula.

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Subject(s):
Math, Precalculus and Calculus, Trigonometry, trigonometric functions (Simplifying), trigonemetric identities, sum and difference formulas, Trigonometric Equations
  50 minutes
cos a b formula
 
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