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Edexcel A2 C4 Mathematics June 2015 - Official Thread Watch

1. (Original post by Dingdongdidly)
Hopefully you can read my writing! I integrated by parts twice then replaced the last part with 9 times the original integral and then took it over to the other side.
just got it hahah! i made a silly mistake by taking the half out and then keeping it in at the same time, thus resulting with -1/4 instead of -1/2 at the end

thankyou!
2. (Original post by ember8)
just got it! when i multiplied it by my dx/du which was -1/2(2-u)^1/2 i accidently multiplied it and then took the two out, and then wrote the 2 in again for the denominator in later working! silly mistake hahah

thanks for your help!
Good job
3. Really scared now lol.
4. (Original post by ember8)
anyone know how to do this question? Solomon L, question 3a and 3b!
mark scheme is confusing
do you still need help in 3b ?
5. (Original post by Maham88)
do you still need help in 3b ?
having a stab at it right now, did you get the correct answer that they're looking for?
6. (Original post by Bustamove)
I hate consecutive exams... especially when it's 2 of my most important ones... (applying for econ at uni)....

If only there was a day in between, or even if the econ unit 3 was in AM rather than PM...
Ah well... what's done is done.... I dont think I'm getting that A*...
time to just focus on C4 and then beg the maths Gods to make it low enough for me to get an A in C3...
I feel your pain dude, how did you find econ3?
7. (Original post by Leking9)
I feel your pain dude, how did you find econ3?
feel for you, how did you find c3? hope they lower the grade boundries by atleast 4 ums *fingers crossed*
8. (Original post by ember8)
having a stab at it right now, did you get the correct answer that they're looking for?
doing it right now
9. Got a feeling we're in for a big 14 marker on rates of change.
10. When integrating tanx, can you write lnIsecxI directly, or must you show your working...?
11. (Original post by AffirmedCube)
When integrating tanx, can you write lnIsecxI directly, or must you show your working...?
its given in the formula book so theyd expect you to just use it, unless they state otherwise (showing a proof)
12. (Original post by AffirmedCube)
When integrating tanx, can you write lnIsecxI directly, or must you show your working...?
I think because it's in the formula booklet you can write it directly

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13. (Original post by ember8)
having a stab at it right now, did you get the correct answer that they're looking for?
i got it , you have to use the sum and product identities
14. (Original post by anonwinner)
wtf is that
Newtons laws of cooling?? Has any one else never heard of this??
15. (Original post by ember8)
its given in the formula book so theyd expect you to just use it, unless they state otherwise (showing a proof)
(Original post by TH3-FL45H)
I think because it's in the formula booklet you can write it directly

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Thanks guys, just to be clear (cos I forgot haha), how would you go about integrating tanx, assuming I do not know that it is lnIsecxI..
16. (Original post by Holdaboss)
Got a feeling we're in for a big 14 marker on rates of change.
14 marker on rates of change.. impossible
17. (Original post by JayGreen)
Newtons laws of cooling?? Has any one else never heard of this??
yep, moving onto that after this paper, check examsolutions c4 spec he has a video on it
18. (Original post by Ripper Phoenix)
14 marker on rates of change.. impossible
I meant differential equations, ignore me.......
19. (Original post by Maham88)
i got it , you have to use the sum and product identities
mines got too long winded, ive ended up with cubic functions, any chance you could send me a picture of your working?
20. Do you actually get a mark normally for the (+c) in integration?

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