Edexcel C3,C4 June 2013 Thread

That's a nice question, plenty of trigonometry in it.

OK, firstly, you got $\dfrac{dx}{d\theta}$. There's no need to write it as $\dfrac{d\theta}{dx}$ in this case; just substitute in:
$\sec \theta \tan \theta d\theta$
$\sec^2 \theta$
and don't forget to change the limits.

So:

$\displaystyle \int_2^3 \dfrac{1}{(x^2-1)^{\frac{3}{2}}} dx$

Write it as:

$\displaystyle \int_\frac{\pi}{3}^{arccos(\frac{1}{3})} \dfrac{\sec \theta \tan \theta}{(\sec^2 \theta -1)^{\frac{3}{2}}} d \theta$

Now, how else can you write $sec^2 \theta - 1$ ? Then do some simplifying and you should get it.

Hey!

I'm stuck on question 3 and 8 in the C4 specimen paper. I'm in the early stages of solving and would really appreciate if any solves them for me as they are not in ExamSolutions.

Thank you in advance!

Hey!

I'm stuck on question 3 and 8 in the C4 specimen paper. I'm in the early stages of solving and would really appreciate if any solves them for me as they are not in ExamSolutions.

Thank you in advance!

I need 95% in both c3 and c4 to even get an A ((


This was posted from The Student Room's iPhone/iPad Ap

I need 95% in both c3 and c4 to even get an A ((


This was posted from The Student Room's iPhone/iPad Ap

How many papers has everyone done?

I feel like I am focusing too much on my other Exams and not enough Maths. I did a Solomon yesterday and I found it challenging, or more challenging that I should have done.

I've only done about 6 Solomons for C4 and about 2 for C3, I'll have to pick it up after my May exams are finished though! 100 UMS in both here I come!


Posted from TSR Mobile

How many papers has everyone done?

I feel like I am focusing too much on my other Exams and not enough Maths. I did a Solomon yesterday and I found it challenging, or more challenging that I should have done.

Okay perfect cheers again Maths Nerd, Yeah glad your doing that, I will try to pick it up a bit like next week! Keep up the good work mate haha !!

If I was in your position I'd get my earlier exams out of the way first and not go crazy with these past papers as for some people they peak too early before the exam and never make up for it later on, just do about. 2-3 a week would be sufficient for now until the exam gets closer. This is only a suggestion and you don't have to follow it if you don't want to, just don't burn out from all these exams!


Posted from TSR Mobile

Good morning

how are you

can you please check this question http://www.examsolutions.net/a-level-maths-papers/worked-solution/worked-solution.php?paper_id=400&solution=6.3
6)d)ii)


I am using substitution by parts?

I used

u= Inx du/dx = 1/x

v= 1/2x²-x dv/dx = (x-1)

so I did

(Inx)(1/2x²-x) - integral sign (1/2x²-x)(1/x) dx

where am I going wrong

You haven't gone wrong, this is correct so far.

Just do the integration and evaluate using the limits, you'll get the right answer.

If I was in your position I'd get my earlier exams out of the way first and not go crazy with these past papers as for some people they peak too early before the exam and never make up for it later on, just do about. 2-3 a week would be sufficient for now until the exam gets closer. This is only a suggestion and you don't have to follow it if you don't want to, just don't burn out from all these exams!


Posted from TSR Mobile

So how's life for the chosen one

not too sure where to start on this question help please !

not too sure where to start on this question help please !

not too sure where to start on this question help please !