[Amy-Rose]

(Original post by TrampingRampage)
I need an A* too I got 85 UMS in C3 so I am retaking that, but ideally I hope this goes well because I don't have time to do much for C3 with my other exams.
I am dreading the comprehension so badly, and I hope silly mistakes don't occur because you can't afford to lose any marks in Paper A given the unpredictable Paper B (I liked the Sudoku comprehension but didn't dig the others). I just hope this paper is a good one!

Good luck everyone!

I panicked in the C3 exam so did rather badly, but just to see how I was doing, the other day I did a random paper and got 69/72 without any real revision so feeling much better. You never know. I agree on the sudoku one, I really enjoyed that one. The geometric sequence one was alright too.

But omg the waves one :'(

[TrampingRampage]

(Original post by Amy-Rose)
I panicked in the C3 exam so did rather badly, but just to see how I was doing, the other day I did a random paper and got 69/72 without any real revision so feeling much better. You never know. I agree on the sudoku one, I really enjoyed that one. The geometric sequence one was alright too.

But omg the waves one :'(

Wow that's really good and with no revision, I guess C3 is still fresh in your mind! Yeah when I did the past papers before doing the January C3 I got near full marks, but the January C3 paper was extremely difficult for me, and I also panicked which made it worse.. But I think the pressure of knowing this is the last time for me to get it right for an A* is making me all panicky so I hope I can relax..

It's just the degree of unpredictability of the comprehension I don't like, and the boundaries for A* are ridiculously high for some (like the 83/90 for the Jan 09 one for 90 UMS! That paper wasn't THAT EASY) but fingers crossed because the Jan 12 papers were quite difficult, our papers this time will be reasonable

I haven't done the waves one :P I saw it and was put off immediately haha! Have you done most of them? I have only tried three comprehension ones, and I only get around 10-14 marks

Good luck on your exams!

[Landa]

How do you remember the trig indentities ???
having difficulties with this

[Amy-Rose]

(Original post by Landa)
How do you remember the trig indentities ???
having difficulties with this

There's only really 7 that I had to 'learn' and just spend half an hour rewriting them in different colours, thats what I did last week and I can still remember them.

Ones like cosec(theta)=1/sin(theta) are easy to remember as it is 1/(the one that starts with the third letter) ie. cosec=sin, cot=tan, sec=cos, if you didn't already know that trick.

Just write them all down on the question paper in a list once you get in, and when you need to use them, refer to the list and pick the one you need.

[rasklatz]

Anyone got any tips for comprehension? I assume we are allowed highlighters?

[laura94]

For me the comprehension (I hope/beg) will be fine, as I tend to get full marks on them.
Paper A though..... ohhhh dear. I'll be so devastated if I don't get an A overall, not only because I'll miss my uni offer but also because I've worked so damn hard at maths this year, doing both AS and A2 at once. I think I only need a high C to get an A overall but at the moment, I'm not even sure I'll get that

[steven hawking]

Does anybody have the Jan 2012 paper please?
thanks

[Fatima0065]

Are you just doing past papers as practice and going over questions that you got wrong? any other ways of getting a high grade in this paper?? wud be grateful for all ur suggestions..thanks

[nju]

(Original post by steven hawking)
Does anybody have the Jan 2012 paper please?
thanks

http://www.thestudentroom.co.uk/show...%20june%202012

[nju]

http://mei.org.uk/files/papers/c409ju_as36.pdf

Could someone please help me with q7)i as I don't get why they changed the signs of the direction in the vector equation bit

[Ninjaelephant]

(Original post by nju)
http://mei.org.uk/files/papers/c409ju_as36.pdf

Could someone please help me with q7)i as I don't get why they changed the signs of the direction in the vector equation bit

not sure but I don't think the sign matters in that part as they both take you along the line, just in a different direction.

however, not completely sure as im not that good at maths

[nju]

(Original post by Ninjaelephant)
not sure but I don't think the sign matters in that part as they both take you along the line, just in a different direction.

however, not completely sure as im not that good at maths

Sorry I don't think my question was clear. The vector AB is -1x-2y so when you are writing the vector equation why does the direction bit change to 1x+2y

[Ninjaelephant]

(Original post by nju)
Sorry I don't think my question was clear. The vector AB is -1x-2y so when you are writing the vector equation why does the direction bit change to 1x+2y

according to mymaths, there are multiple ways to write the vector equation of a line and instead of doing the usual r = a + lambda(b-a) you can also do
r = b + lambda(a-b). hope this helps but if not try looking on mymaths if you have access to it.

[nju]

(Original post by Ninjaelephant)
according to mymaths, there are multiple ways to write the vector equation of a line and instead of doing the usual r = a + lambda(b-a) you can also do
r = b + lambda(a-b). hope this helps but if not try looking on mymaths if you have access to it.

Oh I get what you mean thanks for your help

[Fatima0065]

Hi! can someone help me please...basicaly you know when you find angles from the trig equations..when you need to find angles between 0-360 what do you do with sin and cos i know that for tan you add 180.
oh and for 0-720 ...if that makes sense

[LastHype]

(Original post by Amy-Rose)
There's only really 7 that I had to 'learn' and just spend half an hour rewriting them in different colours, thats what I did last week and I can still remember them.

Ones like cosec(theta)=1/sin(theta) are easy to remember as it is 1/(the one that starts with the third letter) ie. cosec=sin, cot=tan, sec=cos, if you didn't already know that trick.

Asides from the obvious 3, what are the other 4 we "need" to know?

[Amy-Rose]

(Original post by LastHype)
Asides from the obvious 3, what are the other 4 we "need" to know?

I never said you "need" to know any! My personal way of tackling trig questions is to have the list I've learnt to work from, you may need to learn fewer than them and that's fine...

sin^2x+cos^2x=1
tan^2x+1=sec^2x
cot^2x+1=cosec^2x

sin2x=2sinxcosx
cos2x=cos^2x-sin^2x
cos2x=1-2sin^2x
cos2x=2cos^2x-1

tan2x=2tanx/1-tan^2x

[Fatima0065]

im gona ask all the questions i'm not sure about,,,her's one basically
whe you have rsin(x-alpha) or rsin(x-alpha)
and they ask you how to find the coordinates of the turning pointsh, how would you do this i know, that r=x so is the min or max value but how would you find the coordiantes for each...thanks in advance..
and could anyone be kind enough to explain q6 on june 2002 paper and why lamda is 3 in Q7 ii)

[LastHype]

(Original post by Amy-Rose)
I never said you "need" to know any! My personal way of tackling trig questions is to have the list I've learnt to work from, you may need to learn fewer than them and that's fine...

sin^2x+cos^2x=1
tan^2x+1=sec^2x
cot^2x+1=cosec^2x

sin2x=2sinxcosx
cos2x=cos^2x-sin^2x
cos2x=1-2sin^2x
cos2x=2cos^2x-1

tan2x=2tanx/1-tan^2x

Ah thank you muchas! I wasn't trying to imply that you'd said that, my teacher thinks it's absolutely vital, hence my "".

[Amy-Rose]

(Original post by LastHype)
Ah thank you muchas! I wasn't trying to imply that you'd said that, my teacher thinks it's absolutely vital, hence my "".

Your teacher suggested you needed them and didn't give you a list or anything? Harsh. Anyway, no problem!