Edexcel C3,C4 June 2013 Thread

Hey guys, I was wondering if anyone could help me. On the C3 Jan 12 paper Q)5) I get the first value but how do you get 2nd and 3rd values for trig questions? I see sometimes they do 180 - original or 360 + original is their a reason for this?
This goes for trig questions in general how do you get the "other" answers?

Any help is appreciated!

Hey guys, I was wondering if anyone could help me. On the C3 Jan 12 paper Q)5) I get the first value but how do you get 2nd and 3rd values for trig questions? I see sometimes they do 180 - original or 360 + original is their a reason for this?
This goes for trig questions in general how do you get the "other" answers?

Any help is appreciated!

You can use something called the CAST diagram or consider the shape/periodicity of the trig curves. Sorry for asking, but is this not something you did for C2?

Thanks for the quick reply! Yes, I do remember it but I think I used to just draw the diagram out and do it that way not sure though. What do you mean by considering the shape?

Lol.

Two possible options, you either

1. Haven't sat any Solomon Papers under timed conditions
2. If you are finding all 22 Solomon C3/C4 Papers easy you should be sitting AEA or STEP I / STEP II.

They are significantly harder.

Example:
You won't be asked to Factorise a Polynomial of Order 3 in a normal C3/C4 Paper, nor will you be asked to do things such as provide a Counter-Example to disprove a Statement. Nor Comment on the Accuracy of a Model that you generate via differentiation, with respect to Population growth and raw values.

These are typical things in the Solomon Questions.

I didn't time it properly but both were well under 1hour30. I've done all the C3/4 actual papers from 2005 and really, the questions aren't that different. Btw I haven't seen any of the things you have mentioned in your examples, I have only done 1 of each. Do the papers get harder as you move from A-L?

If you do the inverse of sin(1/3) then sketch the sine curve from 0 to 540 and draw a dotted line y=1/3 on the curve then you'll see why.

Thank you. I just did it and got 6.5, 53.5, 126.5, 173.5.

Just to clarify you draw the graph up to 540 as 3theta = sin ^-1 (1/3), and the highest limit is 180, so 180 times 3 = 540.

Also the limits given are theta must be less than or equal to 180 and greater than or equal to 0, right?

For a second I thought it would be less than or equal to 0 which confused me, would they ever ask something like that?

1) change the interval if it says 0 to 180 and you need to work out $sin3\theta=....$ you change both 0 and 180 to 0 and 540. If it was $sin(3x-30)=...$ for example then you would change the interval from 0 to 180 to -30 to 510
2) then you do a quick sketch of the sin curve and work out the inverse sin of the y-value ( in this case 1/3) and then do a dotted line y=1/3 to find all values of $3 \theta$ in the interval 0 to 540.
3) To get values for $\theta$ simply divide all values you found by 3. But only state the values in the interval 0 to 180 as your final answer.

I hope this made sense.

Thank you. I appreciate the help. Was I correct about the limits part?

Just to clarify you draw the graph up to 540 as 3theta = sin ^-1 (1/3), and the highest limit is 180, so 180 times 3 = 540.

Also the limits given are theta must be less than or equal to 180 and greater than or equal to 0, right?

For a second I thought it would be less than or equal to 0 which confused me, would they ever ask something like that?

Hey guys!

I don't really know why I'm posting this but I've been crying for the last half an hour because I'm scared I won't get an A in maths...

I retook C1 this May and definately got 90+ then spent the WHOLE of last week revising C2 but I didn't go to plan (I needed 90+ in that) so I'm stuck with my 82 I got initially, which is so annoying as i basically wasted a whole week for nothing My D1 exam I did went AWFUL!! I'm praying I just scraped a C. And for S1 last year I got 74..

So basically I NEED C3 and C4 to go exceptinally well, meaning I HAVE to get 85+ in each. (But I dunno how high my C1 grade will be so I need to get 85 and 88 minimum in C3 and C4)

I know some of you here got those grades but are pushing for 90+, so how did you revsie? Thing is I won't have time to do all the Solomon papers!!! That's just not possible - I'll barely have time to do all the past papers. But I will definately go through papers from 2005-2013....

Will that be enough do you think??? That's a lot of papers, and I have looked at some 'hard' C3/C4 questions as I did some questions from Solomon papers..
Please say it will be fine - I'm gonna work as hard as I can I'm just so scared I'll miss the A

Sorry for the ramble.. I really wanted to let it all out..
Really reaally need the A for Uni, I just can't miss it - I have to get in!!
Any reply will be appreciated

Can someone help me on Exercise 2E in the Edexcel C3 textbook (Functions chapter uhhh I hate it)
It's question 6.
Determine t^-1(x) if the function t(x) is defined by t(x) = x^2-6x+5 {XER, x=>5)

anyone got the jan paper 2013 for c3 ?

anyone got the jan paper 2013 for c3 ?

http://lmgtfy.com/?q=filetype%3Apdf+edexcel+c3+january+2013+paper#

Enjoy

C4

Has Newtons law of cooling ever come up? in relation to forming differential equations