Edexcel A2 C4 Mathematics June 2015 - Official Thread

tbh, that C3 exam wasn't that hard... I don't know what came over me in the exam... maybe it was lack of sleep or something, but after comparing my answers with Arseys.. I made some ridiculous stupid mistakes... I know the grade boundaries for an A will be somewhere between June 13 -14... I don't think it will fall that much from june 2014 tbh... Arsey predicts 57 ums for an A.. I pray that his prediction is correct...

i think it caught people off guard because of the wording/style of the questions :/ me too, i wanted just a good solid B in this, but lack of sleep and stress turned me into a headless chicken in that exam, ended up realising what i needed to do for most questions when the time was already up which is a shame

Reply 1761

Maham88

2

Original post by ember8

so if it was say cos3xsinx, or sin3xsinx, what would the formula look like? as in, is it always sina +sinb?

basically you have to look at the right hand side of the sum and product identities and see which ones are similar to one you are integrating
so for sin3xsinx it is similar to cosA- cosB =-2sin((A+B)/2) sin((A-B)/2)
for cos3xsinx it is similar to sinA- sinB =2cos((A+B)/2) sin((A-B)/2)
and then you integrate . hope that makes sense :smile:

Reply 1762

joe1545

14

Original post by Bustamove

Nice!

don't you mean June 2014? I don't think theres a Jan 2014...

Naa, if tomorrows papers anything like the June 2014 paper I can kiss good bye to an a* i done a jan 2014 international C4 paper from edexcel

Reply 1763

maccisha

2

Original post by kdevitto

Does anyone have a guide or a way of thinking on how to tackle differential equations? When I've started them I'm fine I just find it hard to know where to start? Thanks :smile:

there is a diffferentials section on this pdf that might help? :smile:

http://www.drfrostmaths.com/uploads/JFrost/files/C4CheatSheet.pdf

Reply 1764

H0PEL3SS

12

Original post by Bustamove

tbh, that C3 exam wasn't that hard... I don't know what came over me in the exam... maybe it was lack of sleep or something, but after comparing my answers with Arseys.. I made some ridiculous stupid mistakes... I know the grade boundaries for an A will be somewhere between June 13 -14... I don't think it will fall that much from june 2014 tbh... Arsey predicts 57 ums for an A.. I pray that his prediction is correct...

I need A*AA for my econ offer too, but no, it wasn't hard, it was just harder than normal. I still found it quite simple.

Reply 1765

ember8

2

Original post by Maham88

basically you have to look at the right hand side of the sum and product identities and see which ones are similar to one you are integrating
so for sin3xsinx it is similar to cosA- cosB =-2sin((A+B)/2) sin((A-B)/2)
for cos3xsinx it is similar to sinA- sinB =2cos((A+B)/2) sin((A-B)/2)
and then you integrate . hope that makes sense :smile:

you're a star!
:clap2:

Reply 1766

maccisha

2

Original post by jubilant_joej

Partial fractions:
If the fraction is top heavy by one degree, e.g has x^3 on top and x^2 on bottom, then it can be expressed in the form Ax + B + C/denominators - is this correct?

yeah, and if it is the same e.g. x^2 on top and x^2 on the bottom it can be done as A + B/denominators

Reply 1767

ember8

2

Original post by H0PEL3SS

I need A*AA for my econ offer too, but no, it wasn't hard, it was just harder than normal. I still found it quite simple.

whats your grade boundary prediction?

Reply 1768

joe1545

14

How do you find percentage error?

Reply 1769

Maham88

2

Original post by ember8

you're a star!
:clap2:

haha thanks :h:

Reply 1770

Freddy-Francis

9

Guys what shapes volume equations do we need to know and area.

cone?

Reply 1771

username1571649

17

I agree so much

Posted from TSR Mobile

Reply 1772

Freddy-Francis

9

Original post by joe1545

How do you find percentage error?

error / true value * 100

Reply 1773

Bustamove

19

Original post by ember8

i think it caught people off guard because of the wording/style of the questions :/ me too, i wanted just a good solid B in this, but lack of sleep and stress turned me into a headless chicken in that exam, ended up realising what i needed to do for most questions when the time was already up which is a shame

I made some massive stupid mistakes which made me head bang the table once I realised what I did....
e.g.
Question 9.. I forgot that K was a negative constant.. so wrote decreasing.. even though it was highlighted in BOLD.... like wtf.. how can I not see it? 2 marks gone...

question 2... I forgot the label the point where the graph intersects the x axis...
I worked it out, but I forgot to put it on... I also forgot to put the asymptote for the second graph.. (I just wrote y=5 at the bottom but I didn't label it.. Worked it out, forgot to draw it in the diagram..)
Thats 3 of the easiest marks lost from that 6 marker diagram question...

this continues throughout my paper.. I don't know what the **** was wrong with me in that exam hall.... all those mistakes had led me to getting borderline A if Arsey's prediction is correct...

I'm gonna make sure I get a good sleep tonight... What I did in C3 may have costed me my A* and my uni offer...This is deffo not going to happen tomorrow.. I will make sure of it...

(edited 8 years ago)

Reply 1774

Maham88

2

Original post by joe1545

How do you find percentage error?

i think its (exact - approx/estimate )/exact *100

(edited 8 years ago)

Reply 1775

frozo123

12

https://a086a5a2f39bda93734c56a63fab1d7be0a9ba38.googledrive.com/host/0B1ZiqBksUHNYQXE5T2xiNDBRd2s/June%202014%20(R)%20QP%20-%20C4%20Edexcel.pdf

How do you do Q7? fml

Reply 1776

joe1545

14

Original post by Freddy-Francis

error / true value * 100

So say if the exact area under the curve is 10, and the approximated value is 9,

then the percentage error = (10-9)/10 * 100 = 10%

Reply 1777

Freddy-Francis

9

Original post by frozo123

https://a086a5a2f39bda93734c56a63fab1d7be0a9ba38.googledrive.com/host/0B1ZiqBksUHNYQXE5T2xiNDBRd2s/June%202014%20(R)%20QP%20-%20C4%20Edexcel.pdf

How do you do Q7? fml

Integrate

Reply 1778

AdrianW7697

Guys for integration in C4 how are we supposed to tell which integration method we should use? :confused:

Reply 1779

ember8

2

Original post by Bustamove

I made some massive stupid mistakes which made me head bang the table once I realised what I did....
e.g.
Question 9.. I forgot that K was a negative constant.. so wrote decreasing.. even though it was highlighted in BOLD.... like wtf.. how can I not see it? 2 marks gone...

question 2... I forgot the label the point where the graph intersects the x axis...
I worked it out, but I forgot to put it on... I also forgot to put the asymptote for the second graph.. (I just wrote y=5 at the bottom but I didn't label it.. Worked it out, forgot to draw it in the diagram..)
Thats 3 of the easiest marks lost from that 6 marker diagram question...

this continues throughout my paper.. I don't know what the **** was wrong with me in that exam hall....

nah you'll be fine, docking 2/3 marks here and there will probably still land you a good solid A
i couldnt even figure question 9 out, im pretty sure if id done that in timed conditions at home with a bowl of icecream id have got a lot more marks hahah, exam halls freak me out

Edexcel A2 C4 Mathematics June 2015 - Official Thread

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