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# Edexcel C3,C4 June 2013 Thread watch

1. (Original post by usycool1)
That's a nice question, plenty of trigonometry in it.

OK, firstly, you got . There's no need to write it as in this case; just substitute in:

and don't forget to change the limits.

So:

Write it as:

Now, how else can you write ? Then do some simplifying and you should get it.
cheers bro, i was stuck on this question too, so this helps big time!
2. (Original post by Vaner)
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.

is it on integration using substitution for q.3 and the long worded question using the differential equations for q.8 ?
3. (Original post by Vaner)
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.

well if it is the same question 3 im looking at, here you go. and ill have a go at question 8 later on hope its the right question we are looking at

first thing i would do is differentiate

to get

make dx the subject to get

change the limits by subbing 1 and 0 into
to give you and 0 respectively. then you are ready to go:

(TRY ON YOUR OWN FROM THIS POINT ONWARDS, IF YOU ARE STILL STUCK. FEEL FREE TO CLICK THE SPOILER)

Spoiler:
Show

is then changed to

we know that
=

so sub that in and square it to get

simplify it to get

using you can sub in for
and take out the common factor

to get to

finally you would then integrate it, sub in the limits, multiply in by the half and you will get the answer they are looking for

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

This was posted from The Student Room's iPhone/iPad Ap
5. (Original post by Flounder1)
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 comes? what did you get last year? and what about your third module your doing this year?
6. (Original post by Flounder1)
I need 95% in both c3 and c4 to even get an A ((

This was posted from The Student Room's iPhone/iPad Ap
If you got those scores then I'm sure you'd get the A* as you'd pass all the requirements.

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7. 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.
8. (Original post by Better)
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!

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9. (Original post by MathsNerd1)
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!

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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 !!
10. (Original post by Better)
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.

Yes the sciences especially biology is draining a lot of time and effort from me.
I've done only 3 edexcel pastpapers for C1 and C2, 2 for C3, 1 for M1, none (half) for M2 and none for S1.forget Solomon and Delphis

Edit: I forgot I did 3 M2 papers last month.

Who's in a worse situation?

The thing is when I do maths past papers at home its gets too boring as if revising Biology is more worth then it goes the other way.

Anyways its not how much past papers you do but what you take out if them.
11. (Original post by Better)
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!

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12. (Original post by MathsNerd1)
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!

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Good morning

how are you

can you please check this question http://www.examsolutions.net/a-level...0&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
13. (Original post by otrivine)
Good morning

how are you

can you please check this question http://www.examsolutions.net/a-level...0&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.
14. (Original post by justinawe)
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.
thanks!

did you get my message for vectors please
15. (Original post by MathsNerd1)
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!

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So how's life for the chosen one
16. (Original post by ACBLISS)
So how's life for the chosen one
Lol, not too bad considering I'm not the chosen one Although I refused to complete a C4 paper today because I looked at the questions and they seemed incredibly easy, I could even do some of them in my head without writing anything down! STEP has definitely helped me in that manner and I'm looking for 100% in my Chemistry tests now!

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17. not too sure where to start on this question help please !
Attached Images

18. (Original post by masryboy94)
not too sure where to start on this question help please !
The ratio of r to h is throughout, using the concept of similar triangles.

So

Sub this into the formula for volume of a cone.
19. (Original post by masryboy94)
not too sure where to start on this question help please !
the first question you use the similar triangle formula which is Radius divided by the height,

Differentiate the the volume and then from the similar triangle make R the subject and once you did that you sub that into the differentiated equation
20. (Original post by masryboy94)
not too sure where to start on this question help please !
You need to find an expression for r in terms of h.

Spoiler:
Show
If you look at the two triangles in the cone (16 and 24 are the lengths of one triangle, and r and h are the side lengths of the other triangle), and use the fact that they are mathematically similar, you can get an expression for r in terms of h.

Spoiler:
Show
As the angles are the same in each triangle, try finding for each of the triangles and then setting them equal to each other.

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