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# Edexcel C3 June 2016 - Unofficial Mark Scheme

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1. (Original post by Aerosmith)
can someone please put up the worked solution to question 5(i). starting to panic
Agreed but no one will upload it this evening I don't think. KPrime will be uploading it tomorrow though. I suggest just avoiding this discussion until KPrime uploads his solutions.
2. (Original post by NVismvlol)
Agreed but no one will upload it this evening I don't think. KPrime will be uploading it tomorrow though. I suggest just avoiding this discussion until KPrime uploads his solutions.
Ok think I will but did you get tanx=3/4??
3. Anyone remember what 6(b) was exactly? I have a feeling I accidentally left it out...
4. Hey, how many marks would I lose for part 9c for having -5 instead of 5, providing that i got ln(2+2e^-1) - the ln right, but not the 5.

(Original post by veldt127)
I'm not 100% sure on all of these, but I think most are correct.

Question 1
Spoiler:
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A. -5, 6
B. 6
Question 2
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A. (20-4x^2)/(x^2+5)^2
B. >sqrt(5), <-sqrt(5)
Question 3
Spoiler:
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A. R= sqrt(5)
a= 26.57°
B. 33.0°, 273.9°
C. 86.1°
Question 4
Spoiler:
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Ai. 21
ii. ln(2.5)
iii. 25
B. Show that question
C. 1.4368, 1.4373
D. Show the root was in [1.4365, 1.4375]
Question 5
Spoiler:
Show
i. 0.9463
ii. 0.5cosec(4Y)
Question 6
Spoiler:
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A. A=3, B=4
B. Normal eqn. -0.5x + 17.5
Question 7
Spoiler:
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A. graph of arcsin, sort of a rotated S shape. Went through (0,0), (-1,-pi/2), (1,pi/2)
B. -1-0.5sqrt(3)
Question 8
Spoiler:
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A. Trig proof
B. -2.848, -1.277, 0.294, 1.865
Question 9
Spoiler:
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A. 6.740 - dose after 4 hours
B. show that dose equalled a value after 7 hours
C. 5ln(2 + 2e^-1)
A = 5, B = 2
PDF with working for 1-4 and 9 : http://www.thestudentroom.co.uk/atta...5&d=1466508775
5. (Original post by theereflex)
Anyone remember what 6(b) was exactly? I have a feeling I accidentally left it out...
Finding the normal when x=3 in the curve you found in part (a)
6. (Original post by Inayah03)
It didn't specify having to leave it in a certain form like it usually does so I guess it doesn't matter which form you leave it in just as long as you have the correct values.
REALLY? FVCK YEAHHH, cheers.
7. Does anyone know if there's a list of how many marks each question and part was worth?

Thanks

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8. (Original post by PISA)
Hey, how many marks would I lose for part 9c for having -5 instead of 5, providing that i got ln(2+2e^-1) - the ln right, but not the 5.
Looking at the MS from June 2007 q8 (very similar to this one!) I think you'd drop 1 mark.
9. (Original post by GrandMasti)
You didn't need to simplify 1/2ln(25/4). The question didn't say leave in its simplest form, it only said the exact coordinate.
Are you sure? How do you know?
10. (Original post by GrandMasti)
You didn't need to simplify 1/2ln(25/4). The question didn't say leave in its simplest form, it only said the exact coordinate.
wrong, it explicitly said simplest form
11. (Original post by coolguy123456)
Are you sure? How do you know?
I'm fairly sure it listed them: i, ii in exact, iii
And then 'give answers in simplest form' at the bottom. I'd be surprised if they gave a nice root solution and didn't ask for simplest form
12. can someone please clear up whether it was tanx=3/4 or tanx=4/3 for 5(i)....I'm going nuts over this
13. (Original post by Aerosmith)
can someone please clear up whether it was tanx=3/4 or tanx=4/3 for 5(i)....I'm going nuts over this
3/4
14. Everything is fine apart for 5ii and 6b I don't understand how got those answers. But I'm not sure.

Could anyone please list the marks for each question please?
15. (Original post by Mesosleepy)
3/4
oh thank ****. thank you so much
16. what was question 5
17. (Original post by Aerosmith)
oh thank ****. thank you so much
Ey, what did you get at question 10, I missed that since I didn't have enough time.
18. (Original post by Mesosleepy)
Ey, what did you get at question 10, I missed that since I didn't have enough time.
question 9 you mean?
19. (Original post by Aerosmith)
question 9 you mean?
no question 10
20. (Original post by Mesosleepy)
no question 10
come on now, don't troll

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