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# The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread

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1. Please explain how? What are you guys doing and what are you missingout?

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2. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
Are there any practice papers for FP2, like there were in FP1?

Are there any new syllabus papers apart from June 09-11, Sariff and the ones Dreamweaver posted?
3. Never mind
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Last edited by Trollolollol; 16-06-2012 at 23:00.
4. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
Could anyone explain from this it's p75 in textbook how you get odd even series and what you choose to do? [fp3]
WTF what's that bro
5. Page from textbook, go have a look at p75 for me? Explain how you get different things for n equal odd and even please?

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6. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread

I never thought I'd say I have a problem with a series question - I do not understand the answer !
7. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
(Original post by Moiraclaire)

I never thought I'd say I have a problem with a series question - I do not understand the answer !
what part of the answer don't u understand..
8. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
what part of the answer don't u understand..
how do they cancel down to that?
9. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
(Original post by raheem94)

So the general solutions are

Substituting in gives

In part (b) we got,
When

So sub in in , so you will get
Could you please explain where you got n=15 from? Did you just try random values to get t close to 30?
Last edited by Victor-PP; 17-06-2012 at 01:08.
10. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
(Original post by Victor-PP)
Could you please explain where you got n=15 from? Did you just try random values to get t close to 30?
We try some values and see which is the closest, in this case it is n=15.
11. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
(Original post by Victor-PP)
Could you please explain where you got n=15 from? Did you just try random values to get t close to 30?
Yes i tried random values.
12. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
Could anyone explain me how to do review exercise question 47b? I did half of it only. Thank you.
13. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
(Original post by raheem94)
We try some values and see which is the closest, in this case it is n=15.
Alright, man. Thanks!
14. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
(Original post by King_Arthur)
what part of the answer don't u understand..
How they cancel through anything. I get their list of terms e.g. 2+0.5-1+1+(1/3)-(3/4)+(1/4)-(3/5)+...+things with n in (all right according to them). THEN WHAT :'(
How did they get anything to cancel.
15. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
Hey does anyone have step by step worked solutions for first order differential equations for FP2? I'm having trouble finding the solution curves
Last edited by sammy_93; 17-06-2012 at 14:41.
16. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
Could anyone take a quick look at question 1 from Paper 3 (the ones that Dreamweaver posted)? How the heck do they integrate e^tanx(secx)^2 to just e^tanx ? Am I missing something?
Last edited by Victor-PP; 17-06-2012 at 13:35.
17. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
Could anyone take a quick look at question 1 from Paper 3 (the ones that Dreamweaver posted)? How the heck do they integrate e^tanx(secx)^2 to just e^tanx ? Am I missing something?
chain rule..
18. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
(Original post by Victor-PP)
Could anyone take a quick look at question 1 from Paper 3 (the ones that Dreamweaver posted)? How the heck do they integrate e^tanx(secx)^2 to just e^tanx ? Am I missing something?

Try differentiating and you will see why it works.
19. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
(Original post by Omar1994)
chain rule..
Hey just tried that integral out of interest and i have no idea how to do it either, could you elaborate?

I get that the integral of tanxsecx^2 is 0.5secx^2 but don't know if that's going in the right direction....? the e threw me somewhat!

EDIT: I see it's (e^tanx)(secx^2) not e^(tanxsecx^2)...
Last edited by Rory_M; 17-06-2012 at 14:59.
20. Re: The Edexcel FP2 (22/06/12 - PM) and FP3 (25/06/12 - PM) Revision Thread
(Original post by Victor-PP)
Could anyone take a quick look at question 1 from Paper 3 (the ones that Dreamweaver posted)? How the heck do they integrate e^tanx(secx)^2 to just e^tanx ? Am I missing something?
so e^2x differentiates to 2e^2x, therefore e^tanx diffs to (diff of tanx)e^tanx.

Which is secx^2.e^tanx.... then you reverse the differential to give the integral.

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