Knowing the addition formulas allows for the calculations of double and half formulas. The fourth installment of 16 has the class use the addition formula to develop the double angle trigonometric formulas. Using the double formula, class members derive the half angle formula. Pupils use the new formulas to find trigonometric values in the independent practice.

Concepts

trigonometric, trigonometric functions, trigonometric identities, trigonometric ratios, trigonometric word problems, trigonometry applications

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Additional Tags

math

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Instructional Ideas

• Have the class create a table with all of the addition and subtraction formulas
• Lead a discussion on how to determine which side of an identity to work with to verify the other side

Classroom Considerations

• The class should know the sum and difference formulas

Pros

• Answer keys show the steps required to solve the problem
• The lesson plan provides suggested scaffolding

Cons

• None

Common Core

HSF-TF.C.9 MP2 MP3 MP7