You are Here: Home >< Maths

# Edexcel C3 June 2016 - Unofficial Mark Scheme Watch

1. (Original post by Further)
(x-6)(x+5)=0
x=6
x=-5
2. How did you guys do the proof question? 2cot^2(2A) + tan(A) = cot(A)
Kept getting stuck for some reason, wasn't sure where I was wrong
3. How the **** did I mess up q1a? I did it twice and got like x=1. At least I got b right. So how many marks would I lose for adding them wrong maybe?
4. if you can, could you please put the number of marks for each question, thanks
5. I used -90 and 90 in the arcsin sketch would i lose a mark for that?
6. i bloody skipped 8b so dumb..can anyone tell me if it was difficult
7. I got a different answer for 5i.
Does anyone remember the qs?
8. i couldn't do part a so i thou to come back to it in which i forgot ahhh
9. isnt 1/2sin4x = 2cosec4x? not 1/2cosec4x ?
10. Failed haha
11. can someone PLEASE remind me what was Q5 today I might've skipped that questions I can feel a panic attack coming
12. question for 5i??
13. Does anyone remember what each questions mark was?
14. (Original post by veldt127)
I'm not 100% sure on all of these, but I think most are correct.

1.
A -5, 6
B 6

2.
A (20-4x^2)/(x^2+5)^2 Might not be simplest form
B >sqrt(5), <-sqrt(5)

3.
A R= sqrt(5)
a= 26.57°
B 33.0°, 273.9°
C 86.1°

4.
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]

5.
i 0.9463
ii 0.5cosec(4Y)

6.
A A=3, B=4
B Normal eqn. -0.5x + 17.5

7.
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)

8.
A Trig proof
B -2.848, -1.277, 0.294, 1.865

9.
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

Sorry about the formatting, I'll try to improve it once I'm home.
I agree wholeheartedly with everything. I got stuck on the last bit of 9c) however because I got 5ln(1(2 +2e^-1)) for some bizzarre reason, but that was the only issue

Posted from TSR Mobile
15. (Original post by O\$car)
can someone PLEASE remind me what was Q5 today I might've skipped that questions I can feel a panic attack coming
i skipped question 8 in the same boat..**** our lives
16. (Original post by theri mass)
3b) denominator was 2cos(theta) - sin(theta) -1,
3c) 2cos(theta)+sin(theta)-1

You need to switch sign for cos(theta+Value)=59....

to cos(theta-Value)=59....
Do you know how many marks 3c was worth? I didn't notice the sign change
17. (Original post by PhoenixBlaze123)
How did you guys do the proof question? 2cot^2(2A) + tan(A) = cot(A)
Kept getting stuck for some reason, wasn't sure where I was wrong
LHS:
2/tan2A +tanA
2(1-tan^A)/2tanA +tanA
(1-tan^2A+tan^2A)/tanA
1/tanA
18. (Original post by veldt127)
I'm not 100% sure on all of these, but I think most are correct.

1.
A -5, 6
B 6

2.
A (20-4x^2)/(x^2+5)^2 Might not be simplest form
B >sqrt(5), <-sqrt(5)

3.
A R= sqrt(5)
a= 26.57°
B 33.0°, 273.9°
C 86.1°

4.
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]

5.
i 0.9463
ii 0.5cosec(4Y)

6.
A A=3, B=4
B Normal eqn. -0.5x + 17.5

7.
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)

8.
A Trig proof
B -2.848, -1.277, 0.294, 1.865

9.
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

Sorry about the formatting, I'll try to improve it once I'm home.
Thanks for doing all this! Do you know what the marks for each question were?
19. If you want working, let me know the question and I'll give it a go; this is all I could remember.

Q1-4, 9 Working
Attached Images
20. C3 MS.pdf (123.0 KB, 1910 views)
21. (Original post by fishs003)
Thanks for doing all this! Do you know what the marks for each question were?
Only one I remember is 9 being 2, 2 and 4

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: November 8, 2016
Today on TSR

### What is the latest you've left an assignment

And actually passed?

### Simply having a wonderful Christmas time...

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Useful resources

## Make your revision easier

Can you help? Study help unanswered threadsStudy Help rules and posting guidelinesLaTex guide for writing equations on TSR

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.