Day 24, Mat119: Pre-Calculus

Last time: Section 6.6

Next time: Exercises

Today:

Announcements
- Homework 6.5 is due today.
- 6.4 homework is returned: pp. 467--
  - 4: give exact values. Range of arcsin is ${[-\pi/2,\pi/2]}$
  - 6: ditto. Range of arccos is ${[0,\pi]}$
  - 27: give exact values (construct triangle)
  - 31: ditto
  - General (and important) observation:
    
    ${\sin}$
    
    ${\cos}$
    
    ${\tan}$
    are meaningless on their own. Each takes an argument -- it has to eat something. You must write something like
    
    ${\sin(\theta)}$
    
    ${\cos(\theta)}$
    
    ${\tan(\theta)}$
- Important issue:
  - We're scheduled to have a test on Monday.
  - I have a (relatively minor yet painful) surgery scheduled for Thursday, and I'll be out of commission on Friday.
  - I'd like to move the test to Friday, so that it would be easier for my colleagues (who will have to cover for me).
  - Okay? Any issues?
Questions and problems about

Law of Cosines?
A summary of

Trig properties and graphs

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