[Trollolollol]

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


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[Kaiser7]

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?

[Trollolollol]

Never mind

[Omar1994]

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

[Trollolollol]

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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[Moiraclaire]

I never thought I'd say I have a problem with a series question - I do not understand the answer !

[King_Arthur]

(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..

[Omar1994]

what part of the answer don't u understand..

how do they cancel down to that?

[Victor-PP]

(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?

[raheem94]

(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.

[raheem94]

(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.

[a5a09]

Could anyone explain me how to do review exercise question 47b? I did half of it only. Thank you.

[Victor-PP]

(Original post by raheem94)
We try some values and see which is the closest, in this case it is n=15.

Alright, man. Thanks!

[Moiraclaire]

(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.

[sammy_93]

Hey does anyone have step by step worked solutions for first order differential equations for FP2? I'm having trouble finding the solution curves

[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?

[Omar1994]

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..

[raheem94]

(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.

[Rory_M]

(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)...

[Rory_M]

(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.