Friday, March 5 - Last Day of Unit 4!

Last Day of Unit 4 :)

Today we began class with the following warm-up:

1)Evaluate.
a)



*Remember to put your calculator in radians.*

Is it 5π/6 or 7π/6?
We found it's 5π/6, because you will never find it in quadrant III. With inverse cos, the answer will never be negative. It's range is only positive values. Check your calculator to back your thinking. We talked about how there's a major difference between inverse sin and inverse cos.

b)



Answer was sqrt(6)/6 or 0.408. One way to solve this:
Maci gave a good way to solve this, but since it says "evaluate" we can just use our calculators.

2) Graph.
a)


b) Go to p. 352/102

For these, use calculator, geogebra, or even Mr. O'Brien's http://fooplot.com/index.php to check your answers.

*The only difference between a and b, is that b is shifted over one to the right.

We went over how


actually means


WHOA!!!
Just like how



can be entered into your calculator as...




After the warmup, we went over the quiz and any problems people had. Remember, if you guys are struggling, if you're getting a 20/30 or even a 15/30, that's ALRIGHT! You're on the right track and getting it.

"When you're in college, you'll just be focused on math! It'll be wonderful! It's like heaven." -Mr.OB Quote of the Day (3/5/10)

Applications:

Simple Harmonic Motion: (check out p. 356)



Bearing:
Ocean/Land:
*Always an acute angle.
ex. S 85 (degrees) E

Air:
*Always between 0 degrees and 365 degrees.
ex. 095 degrees

Look at #33 on p. 360.


For next class, practice on p. 359/29, 53, 31, 57, 59 (from HW!).
Remember, we have a quiz next class! Study any old quizzes, because all the problems will be coming directly from the old quizzes. Our unit test will be next Thursday, and ALL our unit's homework will be due.

Alright...signing off...
Happy studying!

Next scribe: Caitlin :)))