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# Edexcel FP2 Official 2016 Exam Thread - 8th June 2016 watch

1. Polar Coordinates is probably the most difficult subject in FP2, anyone have any guides or strategies to learn it?
2. Gonna go ahead and bump this because people seem to have forgotten about it
3. Revising this at the moment, doing differential equations, first order subs.
4. Had an FP2 mock, messed up on one of the complex numbers transformation questions (question was worth 6 marks - should get at least 2). I hate transformations
Apart from that I'm fairly confident I got the rest correct. Including the last question, which was a beautiful second order question

Here's the question if anyone wants to have a go.

Show that the substitution transforms the differential equation

(I)
into the equation

(II)

Hence find the general solution to the differential equation (II) and obtain the general solution of the differential equation (I). Giving your answer in the form y=f(x).
(14 marks)
5. (Original post by edothero)
Had an FP2 mock, messed up on one of the complex numbers transformation questions (question was worth 6 marks - should get at least 2). I hate transformations
Apart from that I'm fairly confident I got the rest correct. Including the last question, which was a beautiful second order question

Here's the question if anyone wants to have a go.

Show that the substitution transforms the differential equation

(I)
into the equation

(II)

Hence find the general solution to the differential equation (II) and obtain the general solution of the differential equation (I). Giving your answer in the form y=f(x).
(14 marks)
This is a nice question, started a minute ago and I'm struggle
6. (Original post by kkboyk)
This is a nice question, started a minute ago and I'm struggle
Hint:

Using
7. (Original post by edothero)
Hint:

Using
I had to revisit 2nd ODE to know which form of particular integral my answer must have. But it took the piss.
8. (Original post by edothero)
Had an FP2 mock, messed up on one of the complex numbers transformation questions (question was worth 6 marks - should get at least 2). I hate transformations
Apart from that I'm fairly confident I got the rest correct. Including the last question, which was a beautiful second order question

Here's the question if anyone wants to have a go.

Show that the substitution transforms the differential equation

(I)
into the equation

(II)

Hence find the general solution to the differential equation (II) and obtain the general solution of the differential equation (I). Giving your answer in the form y=f(x).
(14 marks)
Might as well. We have: so since , we then have, by taking second derivatives:

and

So our DE becomes:

as required.

Now this is easily solvable, the auxiliary quadratic is

So complementary solution is and the particular solution , so:

, then

9. (Original post by Zacken)
...
Yep very nice
10. (Original post by kkboyk)
I had to revisit 2nd ODE to know which form of particular integral my answer must have. But it took the piss.
What have you got up to? You might want to look at Zacken's solution. If you don't understand anything I can elaborate
11. (Original post by Zacken)
So complementary solution is and the particular solution , so:

, then

Hang on, just realised, your particular solution is incorrect
Spoiler:
Show

Split this up

12. (Original post by edothero)
Hang on, just realised, your particular solution is incorrect
Spoiler:
Show

Split this up

Lol yeah, that's what I get for doing it in my head thanks for pointing it out.
13. (Original post by edothero)
Hang on, just realised, your particular solution is incorrect
Spoiler:
Show

Split this up

Yeah I realised my mistake here thanks
14. Hi, please could someone explain how to do question 8c on this paper https://8dedc505ac3fba908c50836f5905...%20Edexcel.pdf in particular how you get arc sin 3/13 as I'm not sure how this is found! Thanks
15. (Original post by economicss)
Hi, please could someone explain how to do question 8c on this paper https://8dedc505ac3fba908c50836f5905...%20Edexcel.pdf in particular how you get arc sin 3/13 as I'm not sure how this is found! Thanks
this should help, find the angle from the origin to the point (5,12) then use the info on the diagram to find the min and max tangents

16. (Original post by DylanJ42)
this should help, find the angle from the origin to the point (5,12) then use the info on the diagram to find the min and max tangents

Thank you so much!
17. Show that the locus of , has the cartesian equation , subject to .
Spoiler:
Show
I think this is a little bit above the syllabus, so don't worry if you don't know how to do it. Also I may have made an error.
18. (Original post by EricPiphany)
Show that the locus of , has the cartesian equation , subject to .
Spoiler:
Show
I think this is a little bit above the syllabus, so don't worry if you don't know how to do it. Also I may have made an error.
Nice questions
19. (Original post by Joshthemathmo)
Nice questions
Thanks
The question is actually in the Edexcel textbook, 3F 7 d, as a 'sketch' problem, I just decided to try it algebriacally.
20. (Original post by EricPiphany)
Thanks
The question is actually in the Edexcel textbook, 3F 7 d, as a 'sketch' problem, I just decided to try it algebriacally.
Fair enough, i haven't really thoroughly gone through the textbook questions. It's nice to see problems tackled from different positions

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