Show budding mathematicans how to find the sine of pi over 12. The third lesson plan in a series of 16 introduces the addition and subtraction formulas for trigonometric functions. Class members derive the formulas using the distance formula and previously derived formulas. They then use these formulas to find trigonometric values for other angle measures.

Concepts

trigonometric, trigonometric functions, trigonometric identities, trigonometry applications, trigonometric ratios, radians

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Additional Tags

math

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Instructional Ideas

• Use the results from the exit tickets to determine those that need additional instruction before moving on to the next lesson
• Develop a matrix that shows the radian measures that come from adding and subtracting known radians

Classroom Considerations

• The class should know the trigonometric values for the special angles

Pros

• Summary provides a list of the addition and subtraction formulas
• Lesson plan highlights where the mathematical practices are incorporated into the lesson

Cons

• None

Common Core

HSF-TF.C.9 MP3 MP7