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Edexcel C2 20th May 2015 Official Thread

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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.

Thanks in advance!

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

Reply 581

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

Reply 582

frozo123

Original post by imfrassin

It's just the paper international students sit because of time zones, usually it feels a bit harder than our Uk papers

Reply 583

yasmin#2

Original post by imfrassin

it means replacement
the international a level ones have a completely different spec and they have c1 and c2 together i think

Reply 584

gdunne42

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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(edited 8 years ago)

Reply 585

akshay.p

i guess you can use both formulas. its the same thing if im not wrong.

Reply 586

1017bsquad

Original post by usmanzubair

Make a physics unit 1 thread pls lol we have that before c2 :frown:

Hey what do you think the 6 marker will be on unit 1 physics?

Reply 587

gdunne42

Original post by 1017bsquad

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?

Reply 588

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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Reply 589

Skygon

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

Reply 590

Medicjug

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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Reply 591

Elinh

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 :tongue:

Reply 592

Skygon

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.

Reply 593

username1162972

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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(edited 8 years ago)

Reply 594

imfrassin

Original post by gdunne42

It means regional
https://knowledgebase.edexcel.com/?p=1749

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so lets say the official c2 paper has been leaked, will we sit the regional instead?

Reply 595

username1162972

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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Reply 596

Medicjug

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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Reply 597

username1162972

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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Reply 598

username1162972

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

Posted from TSR Mobile

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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Reply 599

username1162972

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

Posted from TSR Mobile

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

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