bob

still reviewing for tomorrow.
I was on this net to review
http://webct.merlin.mb.ca/webct/urw/lc4130001.tp0/cobaltMainFrame.dowebct
i didn't find the foci, and how you solve that part.
I still didn't get the foci, and i think I'm good with other stuff.
good luck guys!!!!!

May21st/09

Today we started on the ellipses part of the unit.
if you take the cone again and cut it across at an angle it creates an ellipse.
Reference Jessi.
The word ellipses comes from Greek: (ἔλλειψις ellipse) Means a "falling short". ...
By definition: The locus of points for which the sum of the distances from each point to two fixed points is equal.

Then Mr.K showed us the tip of drawing ellipses: use 2 pin and a elastic. (it's in the slides #4)

In this diagram there is few point to remember about ellipses:

• O is the centre
• the line A1 to A2 is the length of the major axis, the length is 2a.(Major axis is the longer axis of the ellipses)
  
• PF1& Pf2 are the focal radii of the ellipses
• OA1=OA2 are the length of the semimajor axis with length a. (Semimajor means half of the Major axis)
• B1B2 is the length of the Minor axis. it's length is 2b.(Minor axis is the shorter axis of the ellipse)
• OB1=OB2 is the length of the Semiminor axis with length b. (Semiminor axis means half of the minor axis).
• F1 and F2 are called the foci, they are c units from then centre. ( foci because it's more than one)
• A1 and A2 are the vertices of the ellipses.
• B1 and B2 are the endpoints of the minor axis.

Difference between vertical and horizontal ellipses:
Vertical-major axis is going up and down
-minor axis is going left to right
horizontal-major axis is going left to right
-minor axis is going up and down

Remember it's not always a^2+b^2=c^2 in this case it's a^2+c^2=b^2
In an ellipses a endpoint of the minor axis connect with a focus point Will form a right triangle.


the 2 highlighted formula are ellipses for both horizontal and vertical.
In the diagram shown how the Pythagorean works for the ellipses.


In this problem we used the formula fist we find the vertex: which is (3,-1) same as circle.
then 25 is a^2 and 9 is b^2 so the distance of semimajor is 5 and semiminor is 3.
from there we fin c using a^2+c^2=b^2. therefore c is 4 the foci are 4 units left and right of the centre point.

And basically that all we have done today, and be careful don't forget to do ur home work!!!!

Next scribe is misuiz

bob

Well this unite will be end tomorrow.
I still feels confusing about the parts that which kind of problem you use choice formula and when do you use pick formula.
Everything just seem to be really confusing.
there is lots of notes on the slides to help to review once again, also the links the we publish on delicious.

anyways guys good luck for the test, bye!

BOB

Just remember that have to bob
I was still studying!!!! hard !!!!!!!
I didn't get the last part, don't know which formula should use for which question.
Still trying to went over my notes and find out.
Well any way!!!!!! Good luck everyone have a good mark.

Our Awesome DEV Timeline

April 25- have first question finished and polished
May 2- have second question finished and polished
May 9- have third question finished and polished
May 16- have fourth question finished and polished
May 23- have fifth question finished and polished


DUE DATE: June 4

BOB

Another BOB.
I find this unit not very hard, as Mr.K said if u find the cleaver idea than the whole thing will be easy.
I think I still needs some more parties on identities to get more better.
I think more time will help.
Hope I can do better on this unit and good luck everyone!!!!!!

First scribe of the yr

This is my first scribe for this class^_^
I miss the first 10 min of the class, but I think we didn't do much before I come in.
We start off with the question: to prove the identities

This one is simple that just use the formula: to replace then simplify it. there fore it's QED.

For the second question we got 2 solutions which both of them are all correct, bit one is less work than the other one.



VS.
They both are right but I would do the second one.
In the first solution he turned everything in terms of cos and sin, which we will do for most of the questions.
In the second solution, he recognize that so it made the work much more easy and faster. This might not work for every question, but it will work for some of them.

For this question she used the difference of square. Which in Mr.K's work "cleaver idea", he said that in every identities that must be some cleaver idea will help u to proof the identity.

Of course the most fun& important part of class today the dance


I kinda forgot the dance could any one help me and leave a comment to put the dance that we did.


then we did these questions to end the class of today.
In this kind of problem u just have to understand the formula to able to solve the problem.
Hope that everyone understand me. ^_^
Oh next scribe is.........trinhn92 ^_^
Homework for the day is ex16 all 1st 19 question and any 5 out of the last 10 question.

Spirit Week Themes

1. Monday: Sports Day - Sports Obstacle Course
2. Tuesday: Superhero Day - Save the Day Relay Race (you could dress up in a costume or wear a t-shirt that has a superhero logo on it)
3. Wednesday: Twin Day - Talent Show
4. Thursday: PJ/Crazy Hair Day - The Chris Frolic Comedy Hypnosis Show ($2/ticket)
5. Friday: Colour Code Day - Grade War Gym Riot (gr.12s wear green; gr.11s wear blue)

bob

Second Bob of the year.
I'm always confused by the Inverse Functions and Reciprocal Functions. Both of them share the same sign which is really hard to tell which is which.

The last part will be the part that I'm also confused at. You have to know the formula
g(x)=AsinB(x-C)+D Which I can;t really remember. And i still think i have trouble with this part.

I think I'm good with other parts
bye!!!

bob

First bob for this blog!! Two bob today!!!
I think I know most of the stuff.
Still couldn't remember the unit circle.
I'm having trouble with the last part, because i forget to bring glasses that day*_*
I think I'm good with other parts.
I just have to study and review last part.
Good luck everyone + myself ^_^