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# Edexcel C2 20th May 2015 *Official Thread* watch

1. (Original post by Skygon)
Could anyone please guide me through an appropriate way to handle such questions? I get how the trapezium rule works but I have no idea how to set up the range of x values.

Edit:- Only need help with part (b) and (c).

For part c) you could just try integrating 1/2 - 1/2cos2x between pi/3 and 0 and that should give you an idea whether your answer is correct or not
2. What does the R next to some papers mean? Replacement or Regional?
Last year across London did people sit the R paper? Since I heard it leaked last year aswell.

****ting myself becAUSE OF this leak bombaclart
3. (Original post by imfrassin)
What does the R next to some papers mean? Replacement or Regional?
Last year across London did people sit the R paper? Since I heard it leaked last year aswell.

****ting myself becAUSE OF this leak bombaclart
It's just the paper international students sit because of time zones, usually it feels a bit harder than our Uk papers
4. (Original post by imfrassin)
What does the R next to some papers mean? Replacement or Regional?
Last year across London did people sit the R paper? Since I heard it leaked last year aswell.

****ting myself becAUSE OF this leak bombaclart
it means replacement
the international a level ones have a completely different spec and they have c1 and c2 together i think
5. (Original post by yasmin#2)
it means replacement
the international a level ones have a completely different spec and they have c1 and c2 together i think
It means regional
https://knowledgebase.edexcel.com/?p=1749

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6. i guess you can use both formulas. its the same thing if im not wrong.
7. (Original post by usmanzubair)
Make a physics unit 1 thread pls lol we have that before c2
Hey what do you think the 6 marker will be on unit 1 physics?
Hey what do you think the 6 marker will be on unit 1 physics?
why not start a thread on this in the physics forum?
9. Hey guys,

When you prove that something is a increasing function is it when f(x)' is >0 or >=0???

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10. (Original post by Medicjug)
Hey guys,

When you prove that something is a increasing function is it when f(x)' is >0 or >=0???

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f ' (x) > 0
11. (Original post by Skygon)
f ' (x) > 0
That's wha I thought too until in the Solomon paper they used f'(x) >=0

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12. (Original post by yasmin#2)
it means replacement
the international a level ones have a completely different spec and they have c1 and c2 together i think
No International A-Level has the same spec and we sit C1, C2, S1... Ect separately just like a normal A Level the exams are just different so we don't have to get up at 4am to make sure we are doing the exams at the same time as you
13. (Original post by Medicjug)
That's wha I thought too until in the Solomon paper they used f'(x) >=0

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The values of x that you find, are to be included as well. For example if you get x = 3 and -3, and then the inequality ends up being x < -3 and x > 3, 3 is to be included as well. Since f(x) will increase at that value too.
14. (Original post by Medicjug)
That's wha I thought too until in the Solomon paper they used f'(x) >=0

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That is strictly increasing. The f'(x)>0

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15. so lets say the official c2 paper has been leaked, will we sit the regional instead?
16. (Original post by imfrassin)
so lets say the official c2 paper has been leaked, will we sit the regional instead?
Don't think so. All the papers get swapped.

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17. (Original post by physicsmaths)
That is strictly increasing.

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So wait I'm a bit confused. You can write f'(x)>=0 as well as f'(x)>0? But you have to have inclusive inequalities for your x values

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18. (Original post by Medicjug)
So wait I'm a bit confused. You can write f'(x)>=0 as well as f'(x)>0? But you have to have inclusive inequalities for your x values

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Could you show me the question.

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19. (Original post by Medicjug)
So wait I'm a bit confused. You can write f'(x)>=0 as well as f'(x)>0? But you have to have inclusive inequalities for your x values

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This is the definitions
If X_1>X_2 and f(X_1)>f(X_2) then this function is STRICTLY increasing. Ie F'(x)>0
If X_1>X_2 and f(x_1)>=f(x_2) then this function is increasing in the interval ie f'(x)>=0

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20. (Original post by Medicjug)
So wait I'm a bit confused. You can write f'(x)>=0 as well as f'(x)>0? But you have to have inclusive inequalities for your x values

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The two are different. When a function is increasing you say f'(x)>=0

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