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# Edexcel A2 C3 Mathematics 12th June 2015 watch

1. someone help
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2. (Original post by iKaneee)
Try 2014 R paper, hardest one ive seen
Really?

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3. anyone have grade boundaries for last year's c3 paper? Can't find them anywhere!
4. (Original post by JayGreen)
when using dx/dy if you sub in the y value and flip the answer that gives you the gradient
Correct
5. (Original post by aprocrastinator)
anyone have grade boundaries for last year's c3 paper? Can't find them anywhere!
66-a*
60-a
54-b
6. Guys for part C, why is the maximum function when the cos function is at a minimum, rather than when it's at a maximum?
http://gyazo.com/3e96339a8a0d7e1be522e458487dab7d
7. (Original post by cerlohee)
66-a*
60-a
54-b
thank you! Do you happen to know what full ums was?
8. Do we need to know-

- Half angle formula
- factor formula
- Proving double angle formula

?
9. (Original post by cerlohee)
Guys for part C, why is the maximum function when the cos function is at a minimum, rather than when it's at a maximum?
http://gyazo.com/3e96339a8a0d7e1be522e458487dab7d
because you are taking away the function from 10 so if it was at max value then a larger number would be subtracted by 10, so smaller height
10. (Original post by aprocrastinator)
thank you! Do you happen to know what full ums was?
It's always 3xA-2xB so it's 72 )
11. (Original post by studentwiz)
someone help
which paper is this?
12. (Original post by aprocrastinator)
because you are taking away the function from 10 so if it was at max value then a larger number would be subtracted by 10, so smaller height
But I thought you were taking away the negative function, which is effectively adding the function?

EDIT: o nvm i got it sorry!!! you're adding not subtracting the negative cos function haha
thanku!
13. http://www.examsolutions.net/a-level...6&solution=8.2

Why isn't cos() -1? Surely -21/25 is smaller than 21/25?
14. (Original post by TeeEm)
just did this question with one of my students ... (he got eaten badly)
Any takers
Is this the solution?

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15. (Original post by studentwiz)
someone help
use the compound angles first
sin(A - B) = sinAcosB - cosAsinB
cos(A + B) = cosAcosB - sinAsinB
16. (Original post by cerlohee)
It's always 3xA-2xB so it's 72 )
whoa I never knew that lol. THANK YOU!

(Original post by cerlohee)
But I thought you were taking away the negative function, which is effectively adding the function?
so the most negative value would be the minimum...?
17. (Original post by imedico10)
which paper is this?
18. Those IYGB papers are extremely hard, hopefully nothing from there comes up tomorrow.
19. https://b3755649dbd1afe3db91a899c3b9...%20Edexcel.pdf

Anyone help on Q2 part b, not sure where they're getting the solution from/what to use

MS is here:
https://b3755649dbd1afe3db91a899c3b9...%20Edexcel.pdf

many thanks
20. (Original post by SuperMushroom)
Worried haha, how about you?
Not too bad.. I guess it depends whether the paper's good or not..

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