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# Edexcel A2 C4 Mathematics June 2015 - Official Thread watch

1. (Original post by Cosmi)
If you have 3 lns, which order do you add/divide them? Eg. 2ln|2x+1| - 3ln|x+1| + ln|x+3|

Edit: Would it be

yeah dont forget the good old BODMAS... we always do the subtraction last in this case it would lead to division so its perfect the way you've done it
2. (Original post by usycool1)
Yep
(Original post by Ripper Phoenix)
yeah dont forget the good old BODMAS... we always do the subtraction last in this case it would lead to division so its perfect the way you've done it
Thank you very much!
3. Sorry, another quick Q. Can you not integrate sin^2(x) and treat it as (sin(x))^2 and get [(-cos(x))^3]/3? This paper seems to suggest you need to convert it to 1-cos2x using the double angle rule before integrating which gives -(1/2)sin2x.

Edit: Nvm. The rule is for (ax+b) not a function of ax+b.
4. In the following links there are resources for C3/C4 ALL BOARDS

FUNCTIONS

EXPONENTIALS

TRIGONOMETRY

INVERSE TRIGONOMETRIC FUNCTIONS

DIFFERENTIATION

MODULUS

NUMERICAL SOLUTIONS OF EQUATIONS

BINOMIAL EXPANSIONS

IMPLICIT EQUATIONS

RELATED RATES OF CHANGE

PARAMETRIC EQUATIONS (no integration here)

INTEGRATION

PARAMETRIC INTEGRATION

VOLUME OF REVOLUTION

DIFFERENTIAL EQUATIONS

VECTORS
5. What past papers did everyone find particularly difficult or challenging? I'm trying to tackle the hardest papers first to make sure I fully understand the concepts. Thanks in advance for the help!
6. C4 grade boundaries
Attached Images
7. C4 Grade A and B boundaries only.pdf (5.1 KB, 188 views)
8. (Original post by TeeEm)
In your opinion, what do you think made 2011 such an anomalous year for results? The fact that it is possible for there to be only 6 marks between 100 UMS and a B is a bit off putting...
9. (Original post by Fvthoms)
In your opinion, what do you think made 2011 such an anomalous year for results? The fact that it is possible for there to be only 6 marks between 100 UMS and a B is a bit off putting...
Nothing special... happens sometimes
10. Is it me or is c4 easier to get full marks than in c3.
I dont bother doing the range and domain questions...
11. (Original post by JuniorXX)
Is it me or is c4 easier to get full marks than in c3.
I dont bother doing the range and domain questions...
Just you lol.

I find it easier to score A* in C3 but I'm struggling to get an A on C4. I always end up with high B's/low A's on C4 - Damn the vector questions.
12. (Original post by JuniorXX)
Is it me or is c4 easier to get full marks than in c3.
I dont bother doing the range and domain questions...
C3 is much easier to get 100 in then C4. One can make mistakes in C4 in some long integrations sometimes.

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13. (Original post by JuniorXX)
Is it me or is c4 easier to get full marks than in c3.
I dont bother doing the range and domain questions...
(Original post by physicsmaths)
C3 is much easier to get 100 in then C4. One can make mistakes in C4 in some long integrations sometimes.

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i'd say it depends on how you find it yourself. Personally, i find c4 better than c3. We all different
14. I can't even tell C3 and C4 apart - the only way I differentiate between them is "C4 is the one with the vectors"

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15. So ... 90 average on c3 and c4 for A*.
Thisndoesnt include A* in stats does it?
16. (Original post by JuniorXX)
So ... 90 average on c3 and c4 for A*.
Thisndoesnt include A* in stats does it?
no it doesnt
17. Still slacking with my c4 revision.........starting to get on point with c3 & m2
18. how do you know which side to put the C in differential equations?because sometimes i end up getting a negative answer and its wrong when i look it up on the mark scheme
19. (Original post by s234590)
how do you know which side to put the C in differential equations?because sometimes i end up getting a negative answer and its wrong when i look it up on the mark scheme
Where you put the c does not matter.
you have to make sure you integrated probably and correctly solve for c.
if you're talking about questions that involve -ln('c'-X) you have to solve it accordly.
20. Anyone know the average A*, A and B boundaries?

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21. (Original post by Wahid1)
Anyone know the average A*, A and B boundaries?

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If you google 'Edexcel Maths Grade Boundaries', there is a thread that Arsey created a few years back (around 2013) with a spreadsheet that calculates the average grade boundaries for all maths modules.

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