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# Edexcel A2 C4 Mathematics June 2015 - Official Thread watch

1. I'm not entirely sure how to do part b of this question, any ideas?
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2. (Original post by Jack_Linaker)
I'm not entirely sure how to do part b of this question, any ideas?
use x = (7100-8)/-9 and sub it into the expansion
3. (Original post by nbofni)
Attachment 426663Could someone help me with part (c) on this question?? Parts (a) and (b) were fine, but I just can't seem to get the integration right in part (c)
Which part are you struggling to integrate?
4. (Original post by theoeht)
use x = (7100-8)/-9 and sub it into the expansion
That's what I thought, but according to the mark scheme x should equal 0.1
5. (Original post by mar28)
I think i need same, done all past papers from 2005-2014 including 13/14 reserves, done international jan14/15 and 2 solomon papers but today couldn't do todays paper at all Bye University, C4 is going to be very hard too as recently Cores have been getting harder but other modules like S1,M1 and so on have been nicer(thats what people say anyway)
I know what you mean!! Practiced so much for C3 and ended up making a lot of silly mistakes, should be getting 44 raw marks (at the very least, maybe one or two marks higher). Will have to get 100 ums just to scrape a B overall :/ I do think that you'll do great though haha
6. (Original post by Jack_Linaker)
That's what I thought, but according to the mark scheme x should equal 0.1
hmm, what else have you tried?
7. (Original post by theoeht)
hmm, what else have you tried?
Absolutely nothing ahaha. My first thought was to cry, my second thought was to ask TSR, so here I am
8. (Original post by Jack_Linaker)
That's what I thought, but according to the mark scheme x should equal 0.1
change 3rd root7100 to 3r root1000 times root7.1 then 7.1 = 8-9x etc etc
9. How much is 44 UMS? i don't understand how they convert raws to UMS, i didn't make silly mistakes it was only last question i read it as g of inverse rather than quotent rule other than that made no mistake just had no idea what to do, now concentrate on C4 and D2, fun fun.. I think i got 27 marks, really really bad
10. (Original post by theoeht)
change 3rd root7100 to 3r root1000 times root7.1 then 7.1 = 8-9x etc etc
the 3rd root 1000 just becomes 10 and x = 0.1 and then times everything by this 10 at the end
11. (Original post by theoeht)
change 3rd root7100 to 3r root1000 times root7.1 then 7.1 = 8-9x etc etc
That makes a lot of sense, cheers!
12. How much is 44 UMS? i don't understand how they convert raws to UMS, i didn't make silly mistakes it was only last question i read it as g of inverse rather than quotent rule other than that made no mistake just had no idea what to do, now concentrate on C4 and D2, fun fun.. I think i got 27 marks, really really bad
13. (Original post by mar28)
how much is 44 ums? I don't understand how they convert raws to ums, i didn't make silly mistakes it was only last question i read it as g of inverse rather than quotent rule other than that made no mistake just had no idea what to do, now concentrate on c4 and d2, fun fun.. I think i got 27 marks, really really bad
90ums = a*
80ums = a
70ums = b
60ums = c
50ums = d
40ums = e
14. (Original post by Jack_Linaker)
That makes a lot of sense, cheers!
No problem, what past paper is it in?
15. (Original post by theoeht)
90ums = a*
80ums = a
70ums = b
60ums = c
50ums = d
40ums = e
Thanks, but something has gone wrong on here was posting this on C3 thread
16. (Original post by theoeht)
Which part are you struggling to integrate?
The 12sint^2 cost part.

I tried to use by parts for both parts of the integration. Is there a better way to do it that I'm not seeing? Maybe a bit of U-substitution?
17. (Original post by nbofni)
The 12sint^2 cost part.

I tried to use by parts for both parts of the integration. Is there a better way to do it that I'm not seeing? Maybe a bit of U-substitution?
4(sin t)^3
18. This thread has exploded since the C3 exam.
19. (Original post by nbofni)
The 12sint^2 cost part.

I tried to use by parts for both parts of the integration. Is there a better way to do it that I'm not seeing? Maybe a bit of U-substitution?
It's integration by recognition, sometimes the simplest ones look the hardest!

imagine you had to differentiate (sinx)^3, you get 3sinx^2 cosx as you bring the power down and times by the derivative of what's inside the brackets
20. (Original post by Emmi12345)
This thread has exploded since the C3 exam.
How did you find it?

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