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Unformatted text preview: 5.1 Cosine: Sum and Difference Identities
Wednesday, December 01, 2010
7:04 AM We will have a free Friday, which means I
want to do our Skills Test on Block Day
(like we did last week). Is that ok? Agenda:
0. Turn in HW#42
1. Whiteboard Work
2. Lesson  5.1 Cosine: Sum and Difference Identities
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Whiteboard Work
Prove the identity. _________________________________________________
Lesson  5.1 Cosine: Sum and Difference Identities
Goal: Use the cosine sum and difference identities
DOD
Sum and Difference Identities for Cosine Remember your special angles!
Special Angles (in degrees, Quadrant I)
Special Angles (in Radians, Quadrant I) Ch_5 Page 1 ________________________________________________
Examples
Simplify each expression by writing it in terms of cosine of one angle. Rewrite the angle measure as a sum or difference of our special angles.
Can you write
as a sum of special
Can you write
as a sum of special
angles?
angles?
Find the exact value of cos15°
Find the exact value of cos195° Is it easier to think of angle measures in degrees? If so, convert radians to degrees
first!
Find the exact value of Find the exact value of Ch_5 Page 2 Find the exact value of Find the exact value of Find the exact value of the following. Ch_5 Page 3 Find the exact value of the following. Ch_5 Page 4 ...
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 Spring '11
 byrns
 Math

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