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Edexcel C4 June 2016 - Unofficial Markscheme

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1. Pretty sure every answer is now correct. Enjoy

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cos(theta) was 4/5. Left it out by mistake.
2. agree with all
3. How many marks was each question?
4. What was 5a about?
5. Got everything here!
6. What was question 8c?
7. Got the same for everything except for the vector question. I got different cos theta value and area.
8. For 3a, wasn't it πsin(πy) instead of πSin(0.5π) in the denominator?? Cos you were differentiating -Cos(πy)
9. (Original post by Nadia.barakat)
For 3a, wasn't it πsin(πy) instead of πSin(0.5π) in the denominator?? Cos you were differentiating -Cos(πy)
Indeed - I've left the 0.5 from part b. Changing it now.
10. (Original post by Mattematics)
Unsure about 2c - I've put what I got. If I'm wrong I'll change it.

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For 5a, it was dy/dx = -5root3/16, not x
11. Bless up, think I agree with all the marks but probs lost one for not simplifying 6d. Did it ask for simplest form?
12. (Original post by Mattematics)
Unsure about 2c - I've put what I got. If I'm wrong I'll change it.

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I think the 0.5 in question 3a should be a y
13. not so sure on 7b
14. Werent you suppose to differiate Cos(Piy) not 0.5 Pi

I got something like x= 31+ 3Pi / 11+ Pi
15. I put t = -2/5 ln (x/60) ... (same thing but with t as the subject) ... how many marks was that question?

also, if I made a mistake at the start of the implicit differentiation question, getting -sin instead of +sin, how many marks will I lose out of 9? That was the only mistake I made but the whole question is wrong as a result. I am thinking I may lose 5
16. dont remember if i did -root 3 but i remember doing - root3 /8 and multiplying by 8 i hope i didnt write 3 alone
17. (Original post by Mattematics)
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I think your answer to 2(c) is right
18. (Original post by The_Big_E)
For 5a, it was dy/dx = -5root3/16, not x
Fixed.
19. (Original post by olihoughtonold)
I think the 0.5 in question 3a should be a y
Yep, changing now.
20. (Original post by Mattematics)
Unsure about 2c - I've put what I got. If I'm wrong I'll change it.

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For question 3 if I didn't bring pi out the front how many marks will I lose? I got b wrong aswell. Will ecf nice me or is that like -7

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