Post by: MBBS on October 04, 2010, 09:34:32 pm
A. 2(cos A-1)2
B. 2cos22A
C. cos2A
D.sin2A
Please help, I'm totally lost.
Post by: vea on October 04, 2010, 09:38:17 pm
Which is B :\
Post by: sb3700 on October 04, 2010, 09:39:52 pm
So we can simplify:
and
This means B is correct. It's a good idea to check the other options as well (just in case), by applying the double angle formulas again to both of the above forms.
Post by: /0 on October 05, 2010, 01:09:46 am
Post by: MBBS on October 20, 2010, 02:25:40 pm
Post by: pi on October 24, 2010, 07:19:17 pm
Post by: cohen on October 24, 2010, 08:45:08 pm
And at least your teacher is using the book, in GMA at my school, we've only done 2 chapters from the book, and the rest is stuff he makes up.
Post by: pi on October 25, 2010, 06:05:12 pm
Im guessing it's Essential General Maths Advanced (That's the book we're using, and chapter 11 is on this sort of stuff).
And at least your teacher is using the book, in GMA at my school, we've only done 2 chapters from the book, and the rest is stuff he makes up.
lol, we only did a few chapters (there are over 20!). this semester we did complex numbers (from maths quest 12 spesh), mechanics (from maths quest 12 spesh), trig and proofs and loci....
pretty bludge really
Post by: pi on November 14, 2010, 03:55:28 pm
cos 4A+1 is equal to
A. 2(cos A-1)2
B. 2cos22A
C. cos2A
D.sin2A
Please help, I'm totally lost.
lol, this question came up on my GMA exam this year (MHS) question 1 in multiple choice section
Post by: MBBS on November 14, 2010, 04:09:27 pm
I ran out of time for my GMA exam cos I was sooooo bloody pedantic about the earlier questiosn making sure full marks... Not too worried content was easy and others found it hard, so just gotta work on my timing.
Post by: pi on November 14, 2010, 04:16:19 pm
It's pretty easy these days, worked a few hours on it and it's really simple :P
I ran out of time for my GMA exam cos I was sooooo bloody pedantic about the earlier questiosn making sure full marks... Not too worried content was easy and others found it hard, so just gotta work on my timing.
same (except our exam was a killer), only 4 people in our year level (of 200 GMA kids) finished the whole exam (tech-free) -and that includes math olympiads and AMC prize winners! felt like crap afterwards...
got that question though
Post by: MBBS on November 14, 2010, 04:20:33 pm
200 GMA kids, we have like 30!
The actual subject has been pretty easy thus far though.
Post by: pi on November 14, 2010, 04:25:43 pm
Jesus Christ!
200 GMA kids, we have like 30!
The actual subject has been pretty easy thus far though.
our subject co-ordinator is some
When I get mine back, I will post it in GMA Resources for everyone...
Post by: iNerd on November 14, 2010, 04:27:03 pm
He is not Indian. He is Lankan. Please respect his nationality.Jesus Christ!
200 GMA kids, we have like 30!
The actual subject has been pretty easy thus far though.
our subject co-ordinator is some Indian guy with a phD in pure maths (yep, wtf!), and he made us do a third of the yr 12 course as well as the GMA course. Just for fun, he put random unit 1 methods stuff in as well and it was like 30 pages long!
When I get mine back, I will post it in GMA Resources for everyone...
Moderator action: removed real name, sorry for the inconvenience
Post by: lazykid on November 16, 2010, 09:45:23 am
Jesus Christ!]
200 GMA kids, we have like 30!
Jesus Christ! 30 GMA kids, we have like 11!
Post by: pi on November 16, 2010, 03:39:06 pm
Jesus Christ!]
200 GMA kids, we have like 30!
Jesus Christ! 30 GMA kids, we have like 11!
lol, my class alone has double of that. Wish my class sizes were smaller, a better student to teacher ratio would be nice...
Post by: Plan-B on November 16, 2010, 04:42:35 pm
Jesus Christ!]
200 GMA kids, we have like 30!
Jesus Christ! 30 GMA kids, we have like 11!
Our class has 5 including me. We were merged with Year 12 who had 3, so she had half the time to teach the whole syllabus to both the year 12s and our class.
Post by: lazykid on November 16, 2010, 06:16:27 pm
Jesus Christ!]
200 GMA kids, we have like 30!
Jesus Christ! 30 GMA kids, we have like 11!
lol, my class alone has double of that. Wish my class sizes were smaller, a better student to teacher ratio would be nice...
HAHA! teacher to student ratio pfft...try a dropkick teacher who has to learn the topic whilst teaching us...
Moderator action: removed real name, sorry for the inconvenience
Post by: pi on November 16, 2010, 06:24:25 pm
Jesus Christ!]
200 GMA kids, we have like 30!
Jesus Christ! 30 GMA kids, we have like 11!
lol, my class alone has double of that. Wish my class sizes were smaller, a better student to teacher ratio would be nice...
HAHA! teacher to student ratio pfft...try a dropkick teacher who has to learn the topic whilst teaching us...
that sucks, luckily you have VCE Notes!
Moderator action: removed real name, sorry for the inconvenience
Post by: lazykid on November 16, 2010, 06:26:32 pm
it teaches me better than her :)
i feel sorry for her other classes. may they fail in peace :*(
Post by: pi on November 20, 2010, 03:43:28 pm
YES! exactly why i came to VCE NOTES
it teaches me better than her :)
i feel sorry for her other classes. may they fail in peace :*(
I got here for the same reason, but the subjects in question were bio, physics and english!
Post by: HERculina on November 20, 2010, 04:05:01 pm
I use to write page no.s in brackets for my text responses whilst quoting :idiot2:
Post by: pi on November 20, 2010, 04:39:14 pm
VCE NOTES HAS HELPED ME SO MUCH FOR ENGLISH. :smitten:
I use to write page no.s in brackets for my text responses whilst quoting :idiot2:
lol, I used to do the same thing in yr 10... Didn't reealise that there were about 50 different editions of each book, each with different page numbers... :idiot2:
Post by: thushan on November 25, 2010, 01:27:41 pm
Jesus Christ!]
200 GMA kids, we have like 30!
Jesus Christ! 30 GMA kids, we have like 11!
We have about 50-60 GMA guys...nothing like your 200!
How many methods guys pi - 300?
Moderator action: removed real name, sorry for the inconvenience
Post by: dcc on November 25, 2010, 02:55:03 pm
cos 4A+1 is equal to
A. 2(cos A-1)2
B. 2cos22A
C. cos2A
D.sin2A
Please help, I'm totally lost.
I just wish to point out that this type of mathematical exercise is a waste of time - I wonder why they set questions like this, to test peoples gigantic memories?