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# Edexcel A2 C3 Mathematics 12th June 2015 watch

1. (Original post by Medicjug)
I think it's p

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It's not . I've done both parts and I know part a is correct because that's just standard stuff but I only got one solution to part b and I'm not sure if that the only solution (I've checked and it works though). I need to find that mark scheme

Edit: Nevermind, I found it. I got 1 out of the 3 solutions ugh I guess I would've got maybe 4/6 marks? I really need to stop losing easy marks.
2. (Original post by Nurishment)
It's not . I've done both parts and I know part a is correct because that's just standard stuff but I only got one solution to part b and I'm not sure if that the only solution (I've checked and it works though). I need to find that mark scheme

Edit: Nevermind, I found it. I got 1 out of the 3 solutions ugh I guess I would've got maybe 4/6 marks? I really need to stop losing easy marks.
Yeah same I got two out the three and missed the last one. Such a silly mistake

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3. (Original post by Nurishment)
It's not . I've done both parts and I know part a is correct because that's just standard stuff but I only got one solution to part b and I'm not sure if that the only solution (I've checked and it works though). I need to find that mark scheme

Edit: Nevermind, I found it. I got 1 out of the 3 solutions ugh I guess I would've got maybe 4/6 marks? I really need to stop losing easy marks.
these are not easy marks ...
the IYGB papers are very "exotic" ...
they will destroy the weak ...
they will dwarf the arrogant...
they will challenge the very able.
Attached Images

4. (Original post by TeeEm)
these are not easy marks ...
the IYGB papers are very "exotic" ...
they will destroy the weak ...
they will dwarf the arrogant...
they will challenge the very able.

Sorry Based God TeeEm. I was foolish and arrogant in my choice of words.

Edit: I just tried paper z... got stuck on the first question rip
5. what proofing things do we need to know for the exam ?
6. (Original post by Nurishment)
Sorry Based God TeeEm. I was foolish and arrogant in my choice of words.
There is nothing to be sorry about ...
I am just stating the rationale when I sat down to write these papers ...
Attached Images

7. Could someone please show me how to do 7b, couldnt really understand examsolutions method for this one😩
8. (Original post by Medicjug)
Thanksss everyone. How would writing it in cosP+cosQ help?

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Cos(2x-α)-cos(x)=0=-2sin((3x-α)/2)sin((x-α)/2)

Then you solve sin(x-α)/2)=0 and sin(3x-α)/2)=0
9. (Original post by curtiscowan10)
Could someone please show me how to do 7b, couldnt really understand examsolutions method for this one😩
Here you go, hope this helps! Let me know if you have any problems!
10. (Original post by curtiscowan10)
Could someone please show me how to do 7b, couldnt really understand examsolutions method for this one😩
Edit: Solution above ^

It's just simple use of the chain rule and the given equation and co-ordinates. Simple C1 - C2 work (in terms of working out the normal, finding an equation etc.)

I hope this helps (where I have drawn an arrow and my writing is cut off, I just said "this is the final answer but I like to simplify ^^".
11. (Original post by pswindon)
Here you go, hope this helps! Let me know if you have any problems!
Oh darn, you beat me to it
Edit: and yours is neater than mine too. It's a pity I have been damned with bad handwriting but as long as the examiners can read it
12. does anyone know of any tough C3 questions that have popped up in the past?
13. (Original post by pswindon)
Here you go, hope this helps! Let me know if you have any problems!
Perfect thank you!!
14. Are there any predicted papers for edexcel like the GCSE student have?
15. (Original post by pswindon)
Here you go, hope this helps! Let me know if you have any problems!
could you have also done quotient rule ?
16. (Original post by Maths degree)
could you have also done quotient rule ?
You couldn't have since the differential of 5 is 0 and you would've ended up with a differential of the whole equation as 0.
17. (Original post by pswindon)
Here you go, hope this helps! Let me know if you have any problems!
By the way, not sure if you rushed it or misread but your equation at the end is slightly wrong. It should be y+(5/2) = 4/15(x+1), not y-(5/2)=4/15(x+1)
18. (Original post by Nurishment)
You couldn't have since the differential of 5 is 0 and you would've ended up with a differential of the whole equation as 0.
No, as there are two parts to the numerator with the quotient rule. The quotient rule is just a special case of the product rule
19. (Original post by Gome44)
No, as there are two parts to the numerator with the quotient rule. The quotient rule is just a special case of the product rule
Can you do the question (with working) using the quotient rule and post it please?
20. (Original post by Nurishment)
Can you do the question (with working) using the quotient rule and post it please?
Yep, one sec

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