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**Unformatted text preview: **5.5 Multiple-Angle Formulas
Wednesday, September 28, 2011
6:35 AM Agenda:
1. Classwork (preview of quiz on Friday)
2. Lesson: 5.5 Multiple-Angle Formulas
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Your classwork identities are a bit harder than what you will see on your quiz. Feel
free to work with the people around you!
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Lesson: 5.5 Multiple-Angle Formulas
Goal: Use Multiple-Angle Formulas
DOD
Double Angle Formulas Power-Reducing Formulas Half-Angle Formulas
Note about the sign
The used in trigonometry means the
proper sign depends upon the quadrant in which is located. Each identity requires
either + or -, but not both. Ch_5 Page 1 ______________________________
Examples
Find all solutions. Rewrite using a double-angle formula.
graphing. Find the exact values of
, . Check your solution by . Draw the triangle! Ch_5 Page 2 Find the exact values of
, . Draw the triangle! Rewrite the equation in terms of the first power of cosine.
(use the power reducing formulas multiple times!) Find the exact value of and Ch_5 Page 3 (draw a 3-4-5 triangle) Use a half angle identity to find the exact value of Ch_5 Page 4 ...

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