Edexcel C3,C4 June 2013 Thread

I tried converting the limit from x to t but it didn't work for x=1, since you get t^(2)-t+1 which can't be factorised?

Fancy checking for me please?
Ok I thought I did get it right the first time, the bottom of my fraction should be -2, then what do I do?




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A function of a function is like sin(x^2). I was slightly wrong, just realised, as you can use substitutions in other situations, e.g. sinxcosx! The easiest way for that question is to use sec^2x as obviously you don't have to manipulate. What method did you try? To avoid mistakes try more than one way and see if you get the same, or if plug in a value to see if you get the same answer when you have 1/cos^2x and when you have whatever you managed to get (although if you used a substitution that would be a bit harder). Always try to spot the simple solutions, if you can solve it without manipulating then just solve it without making things more complicated

4-8ln2/-2
should be

why can't the cartesian equation be x = ln(root[y+2])
for part b?
correct answer is
y = e^2x - 2

What pieces of info could come up from past units that you would need to know? (That's not in the C4 spec.)

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Good luck tomorrow everyone! Lets hope its a good paper!

For part a) I got up to y =-1/18x +1/18ln(3) +7 is that right?... how would you simplify in terms of logs? Can you?

Just wanted to say, I've been using your videos for the last year and a bit when it comes round to exam time, and you're an absolute life saver (I did not understand S1 normal distribution at all until I watched your videos). Thank you so much for all the stuff that you've uploaded

Hey, I was just wondering if anyone could post a list of the identities we need to know for C4? I've been searching around but can't find anything, the spec wasn't much help to me and I'd just like to make sure there's nothing I've missed out. I know all the ones we need to remember from C3 etc., it's just the C4 specific ones. Thanks in advance.

can you please help me integrate $\displaystyle \int \sqrt {2-2cosx} dx$? I know you use one of the identities but i'm not sure which one