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Edexcel FP2 Official 2016 Exam Thread - 8th June 2016

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Do tricky polar coordinate sketches (eg r^2=a^2 cos(2theta)) ever come up? - I've not seen any in past papers, and haven't learnt them... yet

I know what you mean, I've never seen them come up and they are the hardest thing as there is NO practice in them!

Original post by kkboyk

I'm a little bit worried since my grades are fluctuating a lot (from Cs to A*s), purely because of silly mistakes :/

Same here, some day get an A, another a C. Really stupid.

Reply 1261

kkboyk

Original post by Anon-

yeah I feel you, same here. really hoping for a straightforward paper tomorrow.

QUOTE=themechguy;65544835]ISame here, some day get an A, another a C. Really stupid.

I'm hoping it'll be like June 2014-15, with no hard polar curve questions since they contained quite a lot of good straight forward questions.

Reply 1262

themechguy

Original post by kkboyk

QUOTE=themechguy;65544835]ISame here, some day get an A, another a C. Really stupid.

I'm hoping it'll be like June 2014-15, with no hard polar curve questions since they contained quite a lot of good straight forward questions.

Hoping I got the 100UMS in the M3 so I can afford to get 79UMS in the FP2 for A* lol..

Reply 1263

paradoxequation

Where is the mod(z)=3 coming from?

tsr.png84.8KB

Reply 1264

P____P

Original post by themechguy

I know what you mean, I've never seen them come up and they are the hardest thing as there is NO practice in them!

The book is your best friend then...

Reply 1265

P____P

Original post by paradoxequation

Where is the mod(z)=3 coming from?

Typo on solutionbank

Reply 1266

paradoxequation

Original post by P____P

Typo on solutionbank

Ahh, thank you!

Reply 1267

Student403

Original post by themechguy

I know what you mean, I've never seen them come up and they are the hardest thing as there is NO practice in them!

Same here, some day get an A, another a C. Really stupid.

Try pre09 papers

Reply 1268

kennz

Can we use a pencil and a compass when you have to sketch curves/circles?

Reply 1269

JAllard

Original post by wr123

Can anyone show a way to get from the top to the bottom? I honestly can't understand the (d^2y/dx^2)(dt/dx) part..

Screen Shot 2016-06-07 at 18.03.54.png

Differentiate dy/dx wrt(x) using product rule on the bit in the bracket => d2y/dx2 = -x^-2(dy/dt) + x^-1 (d2y/dt2) dt/dx.

Then, given dy/dx = 1/x (dy/dt), 1/x must equal dt/dx, so replace dt/dx with 1/x => d2y/dx2 = -x^-2(dy/dt) + x^-1(d2y/dt2)(1/x).

Simplify the x^-1 & (1/x) => d2y/dx2 = -x^-2(dy/dt) + x^-2(d2y/dt2).

Sorry the formatting is useless in plain text, I could write it out later, but it'll be after the exam - and my handwriting a rubbish anyway so probably won't be any easier. Hope you can follow it as it is - if not just ask :smile:

Reply 1270

Patrick Gekko

Could they ask us to translate a half line like arg(z-4)=pi/6?

If so how would you go about doing this. Never seen it

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Reply 1271

themechguy

Original post by Student403

Try pre09 papers

Haha no time now

Original post by P____P

The book is your best friend then...

The book gives very limited examples and doesnt explain why you pick the values of theta like they do?

Reply 1272

Rkai01

Whoever else is in London must've heard the thunderstorms. That is a taster of what is to come tomorrow.

Reply 1273

Zacken

Hoping for a maddeningly hard paper this year.

Reply 1274

math42

Original post by Patrick Gekko

Could they ask us to translate a half line like arg(z-4)=pi/6?

If so how would you go about doing this. Never seen it

Posted from TSR Mobile

Well you can just find the equation of the line. probably depends on the question what the fastest/nicest way is

Reply 1275

themechguy

Original post by Rkai01

Whoever else is in London must've heard the thunderstorms. That is a taster of what is to come tomorrow.

Jeez, that was proper movie style lightening. I have never experienced it like that before... our roof sprung a leak...

Reply 1276

somevirtualguy

Can't sleep, going to be a zombie in this exam now. Why is it so hot :frown:

Reply 1277

Pushkin-simonov

My Question 1: when the question ask to sketch the curve (and given equation) in which coordinate system we should do that? Polar or Cartesian? (E.g. Edexcel Text book 7c (pg 135))?
My question 2 : what happening with weather?!?