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

1. (Original post by Cpj16)
Attachment 513351

Hi can someone pls explain this integration, I don't understand it

thanks
It's a standard integral on the c4 formula sheet I think or possibly the c3 section
2. nope not there
3. (Original post by Cpj16)
nope not there
page 6 of formula booklet, im staring at it

Edit: look at this too, http://www.thestudentroom.co.uk/show...25&postcount=4
4. (Original post by Cpj16)
nope not there

3rd from bottom

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5. (Original post by BBeyond)

3rd from bottom

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thanks didn't realise
6. (Original post by EricPiphany)
Attachment 513017
Thank you!
7. Hi, can anyone explain question 8b on this paper please https://8dedc505ac3fba908c50836f5905...%20Edexcel.pdf as I can't seem to follow the differentiation on the mark scheme, would it be possible to work out the equations of the tangents perpendicular to the initial line and find dx/dtheta but I couldn't get this to a point of solving either? Thanks
8. Is there a particular method for questions like 4b on this paper http://www.thestudentroom.co.uk/show...295&highlight= as I'm never too sure how to go about finding which region to shade? Thanks
9. (Original post by economicss)
Is there a particular method for questions like 4b on this paper http://www.thestudentroom.co.uk/show...295&highlight= as I'm never too sure how to go about finding which region to shade? Thanks
I think what he did over there was to choose a sample point to check.
He chose z=1, which lies in the region y < 2x, and the image in the w-plane is clearly inside the circle.
10. (Original post by EricPiphany)
I think what he did over there was to choose a sample point to check.
He chose z=1, which lies in the region y < 2x, and the image in the w-plane is clearly inside the circle.
Thanks so much for your help! Do you know why the area subtracted is -1/9pi times 2squared on question 5b of this paper please https://8dedc505ac3fba908c50836f5905...%20Edexcel.pdf
11. (Original post by economicss)
Thanks so much for your help! Do you know why the area subtracted is -1/9pi times 2squared on question 5b of this paper please https://8dedc505ac3fba908c50836f5905...%20Edexcel.pdf
I haven't done the question, so I can only guess. I think you forgot that to find the shaded region you have to calculate an integral and then subtract a sector of a circle. Use the sector of a circle formula (or just compute the integral for the circle).
12. (Original post by EricPiphany)
I haven't done the question, so I can only guess. I think you forgot that to find the shaded region you have to calculate an integral and then subtract a sector of a circle. Use the sector of a circle formula (or just compute the integral for the circle).
Thank you, I get the 2 squared must be the radius squared of the circle but I can't see how theta is -1/9 pi?
13. (Original post by economicss)
Thank you, I get the 2 squared must be the radius squared of the circle but I can't see how theta is -1/9 pi?
It should be the angle difference between the two intersections.
14. (Original post by EricPiphany)
It should be the angle difference between the two intersections.
Thanks
15. guys, the way the book solves nth root of a complex number using De Moivre's theorem and the way the solution bank/mark schemes are different. the book does this, for example you have z^3, they'll do k=0,k=1,k=-1 whereas the others do k=0,k=1,k=2. I know both of them give the same answer however in terms of notation ,would I be penalized in an exam if I did it the first way? I'm referring to page 37 from the book, and question 30 from review ex 1, thanks
16. (Original post by ChuckNorriss)
guys, the way the book solves nth root of a complex number using De Moivre's theorem and the way the solution bank/mark schemes are different. the book does this, for example you have z^3, they'll do k=0,k=1,k=-1 whereas the others do k=0,k=1,k=2. I know both of them give the same answer however in terms of notation ,would I be penalized in an exam if I did it the first way? I'm referring to page 37 from the book, and question 30 from review ex 1, thanks
If they cared which you did in an exam question, they'd make it clear in the question, e.g. by giving you a range of angles.
17. Hi can someone tell me how to sketch curves like r=a sin 3(theta) or link a youtube video to it. thanks
18. (Original post by Cpj16)
Hi can someone tell me how to sketch curves like r=a sin 3(theta) or link a youtube video to it. thanks
for r = a sin or cos n theta. n loops, each taking pi/n degrees, with space of pi/n degrees between them. Max r = a. Initial line intercept for sin is at origin, for cos at a.
19. I want to ak:

If we have solve (x+iy)^3 = 1

If you solve using binomail theorem, and not use de moivres would you not be rewarded with any marks.

Obviously I would use dmt but some kid was on about this today.
20. (Original post by Mihael_Keehl)
I want to ak:

If we have solve (x+iy)^3 = 1

If you solve using binomail theorem, and not use de moivres would you not be rewarded with any marks.

Obviously I would use dmt but some kid was on about this today.
If the question said "by using DMT" then yes, otherwise no.

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