You are Here: Home >< Maths

# OCR MEI C3 Mathematics June 2016 - Official Thread Watch

1. (Original post by Kira Yagami)
Am i the only one who doesn't like the proof questions? I mean some are okay but some can be weird right, any tips for them?
Try to identify what kind of proof you will need (exhaustion/contradiction/algebraic) and then identify what you need to do for the specific question:

For consecutive integers, they are written as , for three consecutive integers know all of your even times odd etc multiplications.

for contradiction, set up an argument such as there is no common factor etc etc and disprove that argument and hence prove the fact.

exhaustion is pretty easy anyway, prove from 1 through to 10 to fully disprove/prove something. (or the set they give you, eg primes)
2. (Original post by starwarsjedi123)
june 2015:

http://vle.woodhouse.ac.uk/topicdocs.../C32015May.pdf

how would you go about 6 part ii?

ArcSin(x)=ArcCos(x)
Not sure if this is a great way to do it but if you let x = sin(a) = cos(a) then find a value for a where cos(a) = sin(a).
3. (Original post by starwarsjedi123)
june 2015:

http://vle.woodhouse.ac.uk/topicdocs.../C32015May.pdf

how would you go about 6 part ii?

ArcSin(x)=ArcCos(x)
From a method an old teacher of mine used:

arcsin(x) = arccos(x) = t (can be anything, used t for lack of confusion)

therefore

sin(t) = x and cos(t) = x (sin(t) = cos(t) = x)

(as has been done above)

sin(t) = cos(t)
tan(t) = 1 : Divide through by cos(t)
.....
4. (Original post by starwarsjedi123)
june 2015:

http://vle.woodhouse.ac.uk/topicdocs.../C32015May.pdf

how would you go about 6 part ii?

ArcSin(x)=ArcCos(x)
its basically a test of inverses. Arcsin is the inverse of sin, and so (x,y) from sinx goes to (y,x) on arcsin(x). Same goes for ArcCos(x). Therefore you can say that sin(x)=cos(x), find the y value that they are both the same at and that is your x intercept on arcsinx and arccosx (x<-->y when inversed)
5. (Original post by starwarsjedi123)
june 2015:

http://vle.woodhouse.ac.uk/topicdocs.../C32015May.pdf

how would you go about 6 part ii?

ArcSin(x)=ArcCos(x)
Haha I didn't know my college website is eveyones standard for maths
6. (Original post by Lycanfist)
Haha I didn't know my college website is eveyones standard for maths
lol if your college didnt exist we would be screwed.
7. predictions for tomorrow? section b is pretty much the same each year except for 2014 in my opinion. i think there will be an exponential decay question, a modulus question,one differentiation question, one integration question and a proof question in section A. i dont think there will be rates of change
8. (Original post by kevvvvvv)
lol if your college didnt exist we would be screwed.
My college is good, but when it comes to solved solutions, this is the college for you

http://www.sixthform.m34maths.com/A2-level.htm
9. (Original post by The-Spartan)
Try to identify what kind of proof you will need (exhaustion/contradiction/algebraic) and then identify what you need to do for the specific question:

For consecutive integers, they are written as , for three consecutive integers know all of your even times odd etc multiplications.

for contradiction, set up an argument such as there is no common factor etc etc and disprove that argument and hence prove the fact.

exhaustion is pretty easy anyway, prove from 1 through to 10 to fully disprove/prove something. (or the set they give you, eg primes)
Thanks...
10. Do we need to learn the definitions for all the types of mappings and functions etc??? Like what is many-to one , what is a function, what is a mapping etc... ( I know we need to know about odd and even functions) .
11. (Original post by Kira Yagami)
Do we need to learn the definitions for all the types of mappings and functions etc??? Like what is many-to one , what is a function, what is a mapping etc... ( I know we need to know about odd and even functions) .
yep they are all needed, they could be asked for
12. (Original post by Lycanfist)
My college is good, but when it comes to solved solutions, this is the college for you

http://www.sixthform.m34maths.com/A2-level.htm
yeah i use him when i dont understand the mark scheme
13. (Original post by ABeingOnEarth)
Hi Jack, would you please be able to tell me how to do Q8(ii) in the Jan 2012 paper (http://www.mei.org.uk/files/papers/2012_Jan_c3.pdf)? Many thanks.

Hopefully this helps in a way, if you don't get any of the steps I can go through it with you.
14. If you think "when does sin(x)=cos(x)" then we know that is when x is 45 degrees (or pi by 4). Similarly the inverses are the same then so the answer is arcsin(45) which is root 2 over 2. You can check by trying arccos 45 and see that it's the same
15. June 2014 8 part ii) show f'(x) = ....... I just cudnt simplify the quotient derivative expression someone help.....f(x) = (x)/(sqrt 2 + x^2)
Attached Images

16. If you have a grey/silver casio calc then c3 is pretty straight forward
17. (Original post by Jay Garrick)
If you have a grey/silver casio calc then c3 is pretty straight forward
https://education.ti.com/en-GB/uk/pr.../tabs/overview

Guess I'm failing then
18. (Original post by Tajwar786)
June 2014 8 part ii) show f'(x) = ....... I just cudnt simplify the quotient derivative expression someone help.....f(x) = (x)/(sqrt 2 + x^2)

Don't know how useful this is now... But if you just simplify the top into a fraction it becomes a lot easier

Posted from TSR Mobile
19. How did everyone find it?
Reckon grade boundaries are standard (62=A etc)
20. (Original post by The-Spartan)
How did everyone find it?
Reckon grade boundaries are standard (62=A etc)
Nice paper I thought

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: May 9, 2017
Today on TSR

### How to stand out in an Oxbridge interview

What makes you memorable?

### A pregnant woman visits me every night

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

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