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# Edexcel C3 June 2016 - Unofficial Mark Scheme

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1. (Original post by particlestudent)
tomorrow
2. can someone reassure me that question 8b was difficult as i skipped it and how many marks was it..
3. veldt127 is there any chance you could do the log division and Normal to the curve at X=3 question?
4. isn't the solution for 5i) 0.1609 also valid?
5. (Original post by carrm123)
Do you know how many marks 3c was worth? I didn't notice the sign change
2 marks. I remember adding it up as one of the questions I've potentially lost marks on.

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isnt 1/2sin4x = 2cosec4x? not 1/2cosec4x ?
(1/2)(1/sin4x) = (1/2)cosec4x
7. (Original post by Christoph987)
isn't the solution for 5i) 0.1609 also valid?
That's what I got, no idea if you need both or if either would do.

Can't even remember the question
8. how many marks was question 8b gonna kill myself as forgot to do it
9. (Original post by unimaginable118)
Does anyone remember how many marks the last question was? I was SO STUPID. I left it out (( looks like someones not going to uni...
It was a smaller question..8 marks
10. (Original post by Alerdo)
veldt127 is there any chance you could do the log division and Normal to the curve at X=3 question?
Can you remember the quartic and the quadratic it was divided by? I'd need to know that first
11. (Original post by Aethrell)
That's what I got, no idea if you need both or if either would do.

Can't even remember the question
I am sure it was the x coordinate of turning point of e^3x cos(4x)
12. (Original post by jack_98)
can someone reassure me that question 8b was difficult as i skipped it and how many marks was it..
Very difficult, can't remember how many marks though
13. (Original post by jack_98)
can someone reassure me that question 8b was difficult as i skipped it and how many marks was it..
Eh, it was as little bit of tough algebra, I think it was 4 marks.
15. (Original post by Christoph987)
isn't the solution for 5i) 0.1609 also valid?
no as the range was pi/4 and pi/2 and this was the only value that fell inside this range.
16. (Original post by CervixPounder)
Eh, it was as little bit of tough algebra, I think it was 4 marks.
ah how do i get over this as i had plenty of time to do it fml!!! literally wanna kill myself
17. Can anyone remember how many marks each question was?
I remember qu 9 was 8 marks, 2 + 2 + 4..
18. How many marks will I lose if I

1) for question 1b stated both a=6 and a=-5 forgot to reject the answer a=-5

2) for question 2b messed up the range and stated that -rt5<x<rt5 instead

3) for 6b messed up differentiation so got the wrong dy/dx but otherwise method of finding normal and stuff was right?

Will I be able to get my A* in this paper? 🙇🏻

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19. (Original post by JasPuddy)
(x-6)(x+5)? maybe use the quadratic formula to check next time
Just don't know where my head was at today...
20. (Original post by Christoph987)
I am sure it was the x coordinate of turning point of e^3x cos(4x)
Wouldn't there be two turning points? Did it ask for a particular one?

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