September 27, 2006

scribe post day 14

today in class all we did was review for stuff that we learned in grade 12. there were questions on the board as usual. He went throught the two projects that we are supposed to do for this course. he also talked about how we should start to make our groups. he also stated that the video project is supposed to no more than 10 minutes and one minute is too short.

here are some of the questions that Mr.K put on the board. we didn't get to go through all of them since we didn't have enough time.

1) suppose f(X)=x2-1 find:

A) (f o g)(X)
B) (g o f)(X)
C) h(X) = ((f o g) o (g 0 f)) (X)


A) sin2 = (sinx-1)(sinx+1)
-all we have to do to this question is plug g(X) into f(X)
-you can also use the difference of squares


B) sin(X2 -1)
= sin((X+1)(X-1)) ...you could this but it would make it more complicating
****NEVER DO THIS****----> sinX2... sin is not a number its a function

C) sin2 (sin(X2 -1)) - 1


2) find the exact value:
A) sin(pi/3) X cos(5pi/6) + tan(-3pi/4)




this all we go up to.. sry guys.. i don't wanna post answers up on this if i know its not for sure right.

Just like Mr.K said in class ""REMEMBER PATTERNS INSTEAD OF FACTS, PATTERNS CONTAIN A WEALTH OF FACTS"


The unit circle contains many patterns. With these patterns you will memorize the unit circle easier.


REMEMBER "" 1, 2, 3 ""

When using this pattern you always start from the origin. you don't have to mind the denominator because it is always 2, all you have to really care about it the numerator. count ""1, 2, 3 "" from the origin. Count right to find the "COS" value and up to find the ""SIN" value. As you can see from the picture its pretty simple but very hard to explain. So i think that will not explain it because i will just end up confussing you guys.

Well i guess this is practically all we have learned in this class. Mr.K talked about alot of other patterns but they don't apply to us so i won't even mention it.

NO HOMEWORK!!!
PRE-TEST IS ON FRIDAY AND TEST ON MONDAY
don't forget to post up you BOBS before the test.

OH YEAH and the next scribe is MARK!!!!

2 comments:

linger said...

Hi Charlene. good job on your post. the only thing i have to add is on your diagram for question 2, where you have the square root of 3 over 2 times the square root of NEGATIVE 3 over 2, plus 1, the answer should be NEGATIVE 3 over 4 plus one, which gives you the answer we had in class.. 1/4. ohhh, and shouldn't charlotte be the next scribe? because she never did it yet, lol. and it wouldn't be fair for us to start over without her doing one right? anyways, besides that good job on your post again =)

M-A-R-K said...

omg char, im not here tomorow -.-