Edexcel FP2 Official 2016 Exam Thread - 8th June 2016

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Reply 200

BBeyond

Original post by Cpj16

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

(edited 8 years ago)

nope not there

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/showpost.php?p=4564725&postcount=4

(edited 8 years ago)

Reply 203

BBeyond

Original post by Cpj16

nope not there

ImageUploadedByStudent Room1458085429.955360.jpg

3rd from bottom

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Reply 204

Cpj16

Original post by BBeyond

3rd from bottom

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thanks didn't realise

Reply 205

economicss

Original post by EricPiphany

Thank you!

Reply 206

economicss

Hi, can anyone explain question 8b on this paper please https://8dedc505ac3fba908c50836f59059ccce5cd0f1e.googledrive.com/host/0B1ZiqBksUHNYdHIxUkJmdndfMlE/June%202013%20(R)%20QP%20-%20FP2%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 :smile:

Reply 207

economicss

Is there a particular method for questions like 4b on this paper http://www.thestudentroom.co.uk/showthread.php?p=56865295&highlight= as I'm never too sure how to go about finding which region to shade? Thanks :smile:

Reply 208

EricPiphany

Original post by economicss

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.

Reply 209

economicss

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://8dedc505ac3fba908c50836f59059ccce5cd0f1e.googledrive.com/host/0B1ZiqBksUHNYdHIxUkJmdndfMlE/Specimen%20(IAL)%20QP%20-%20F2%20Edexcel.pdf :smile:

Reply 210

EricPiphany

Original post by economicss

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).

Reply 211

economicss

Original post by EricPiphany

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? :smile:

Reply 212

EricPiphany

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? :smile:

It should be the angle difference between the two intersections.

Reply 213

economicss

Original post by EricPiphany

It should be the angle difference between the two intersections.

Thanks

Reply 214

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

Reply 215

tiny hobbit

Original post by ChuckNorriss

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.

Reply 216

Cpj16

Hi can someone tell me how to sketch curves like r=a sin 3(theta) or link a youtube video to it. thanks

Reply 217

EricPiphany

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.

Reply 218

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.