Lesson: Section 4'2 page 259 Topic: The Unit Circle

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Lesson Section 4.2 page 259Topic The Unit
Circle

• Periodic Functions Functions that repeat values
  in a certain pattern.
• For sin and cos, we say
  where
• For example,
  
• For example,
• Why?

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Lesson Section 4.2 page 259Topic The Unit
Circle

• Even Functions
• Even functions are symmetric around the y-axis
  when graphed.
• We say
• Example
• Cosine (cos) and Secant (sec) are the only two
  even functions among the six trig functions weve
  learned.

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Lesson Section 4.2 page 259Topic The Unit
Circle

• Odd Functions
• Odd functions are symmetric around the origin
  when graphed.
• We say
• Example
• Sine (sin), Cosecant (csc), Tangent (tan, and
  Cotangent (cot) are all odd functions.

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Lesson Section 4.2 page 259Topic The Unit
Circle

• Using the TI-83 to evaluate trig functions
• Be sure you have the calculator in the correct
  mode either degrees or radians.
• To put the calculator in the correct mode, press
  mode and then highlight either degrees or radians
  whatever the angle is given in .
  
• Example
• How would you do

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Lesson Section 4.2 page 259Topic The Unit
Circle

• Examples p. 264 2, 8, 16, 26, 34, 38, 40, 44,
  46, 50
• Homework p. 264 1-51 odd, 59

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