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Edexcel A2 C3 Mathematics 12th June 2015
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Original post by iKaneee
Try 2014 R paper, hardest one ive seen
Really?
Posted from TSR Mobile
anyone have grade boundaries for last year's c3 paper? Can't find them anywhere! 
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
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
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
http://gyazo.com/3e96339a8a0d7e1be522e458487dab7d
Original post by cerlohee
66-a*
60-a
54-b
60-a
54-b
thank you! Do you happen to know what full ums was?
Do we need to know-
- Half angle formula
- factor formula
- Proving double angle formula
?
- Half angle formula
- factor formula
- Proving double angle formula
?
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
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
Original post by aprocrastinator
thank you! Do you happen to know what full ums was?
It's always 3xA-2xB so it's 72
)Original post by studentwiz
someone help
which paper is this?
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!
(edited 8 years ago)
http://www.examsolutions.net/a-level-maths-papers/worked-solution/worked-solution.php?paper_id=96&solution=8.2
Why isn't cos() -1? Surely -21/25 is smaller than 21/25?
Why isn't cos() -1? Surely -21/25 is smaller than 21/25?
Original post by TeeEm
just did this question with one of my students ... (he got eaten badly)
Any takers
Any takers
Posted from TSR Mobile
Original post by studentwiz
someone help
use the compound angles first
sin(A - B) = sinAcosB - cosAsinB
cos(A + B) = cosAcosB - sinAsinB
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...?
Original post by imedico10
which paper is this?
https://drive.google.com/folderview?...JHS1ZSTHM#list
Those IYGB papers are extremely hard, hopefully nothing from there comes up tomorrow.
https://b3755649dbd1afe3db91a899c3b9837b22326254.googledrive.com/host/0B1ZiqBksUHNYMG14YWtobVJUUms/for-Edexcel/Solomon%20G%20QP%20-%20C3%20Edexcel.pdf
Anyone help on Q2 part b, not sure where they're getting the solution from/what to use
MS is here:
https://b3755649dbd1afe3db91a899c3b9837b22326254.googledrive.com/host/0B1ZiqBksUHNYMG14YWtobVJUUms/for-Edexcel/Solomon%20G%20MS%20-%20C3%20Edexcel.pdf
many thanks
Anyone help on Q2 part b, not sure where they're getting the solution from/what to use
MS is here:
https://b3755649dbd1afe3db91a899c3b9837b22326254.googledrive.com/host/0B1ZiqBksUHNYMG14YWtobVJUUms/for-Edexcel/Solomon%20G%20MS%20-%20C3%20Edexcel.pdf
many thanks
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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