Yep, haven't you heard? The C4 papers were accidentally leaked and they're scrapping it now. They're going to use a replacement paper

http://www.bbc.co.uk/news/education-18425283

Reply 1343

ThaChronic

Original post by raheem94

You can read more about it here.

Original post by wam-bam

http://www.bbc.co.uk/news/education-18425283

Original post by UWS

Yep, haven't you heard? The C4 papers were accidentally leaked and they're scrapping it now. They're going to use a replacement paper

http://www.bbc.co.uk/news/education-18425283

Wow, had no idea, you're probably right, we'll get screwed over considering the fact it's Edexcel -_-

Reply 1344

NasirNas

What were the grade boundaries for the Jan 12 paper?

Reply 1345

arvin_infinity

Original post by ThaChronic

Wow, had no idea, you're probably right, we'll get screwed over considering the fact it's Edexcel -_-

From now on people from Egypt are my favorite people..anyone happen to be in egypt please let us know-we love you with passion lol

anybody care to explain the iteration method by repeat !

as in you find x1 x2 x3.. till x6
then what should you be looking for ?
say question asks you to find the answer to 3 d.p. would you be looking for 4 d.p. to be constant?

Reply 1346

Jetblast

Original post by arvin_infinity

From now on people from Egypt are my favorite people..anyone happen to be in egypt please let us know-we love you with passion lol

Why?

If edexcel really have papers ready for the next few years, then they are bound to give us the paper for jan 2013 which is predicted to be harder due to ministers stupidity

Reply 1347

wow

Original post by browb003

Here are past paper booklets on each topic for C3 :smile:

Can you upload the c4 ones pleaase

Reply 1348

A level Az

Just did the January 2012 paper and got 70/75, which is 90 ums. I really need this A* so I hope it goes well.

Reply 1349

wow

Damn i hate finding ranges. Do i use a table of numbers, complete the square or draw a graphhh??

Reply 1350

chaosdestro0

Original post by wow

Damn i hate finding ranges. Do i use a table of numbers, complete the square or draw a graphhh??

Find the minima, then just use simple logic to to work out the maximum.
For example if the domain is 0<x<5 and the minimum is at 2, the maximum is going to be at five in the case of an X^2 graph, because it has the largest difference between the minimum possible.
You can also use difference of squares to find the range
So for example
(X-2.5)^2+3
Is going to have a range of
3<=F(x)<infinity.

(edited 11 years ago)

Reply 1351

wam-bam

Original post by ThaChronic

Wow, had no idea, you're probably right, we'll get screwed over considering the fact it's Edexcel -_-

Original post by UWS

Yep, haven't you heard? The C4 papers were accidentally leaked and they're scrapping it now. They're going to use a replacement paper

http://www.bbc.co.uk/news/education-18425283

Original post by raheem94

You can read more about it here.

can someone please explain part (ii)

thanks

Reply 1352

UWS

Original post by NasirNas

What were the grade boundaries for the Jan 12 paper?

I think it was 65 for an A and 58 for a B

it was quite tricky in some parts as well

Reply 1353

YingYang

Original post by wam-bam

can someone please explain part (ii)

thanks

i) LHS = sec^2 x - cosec^2 x
= (1+tan^2 x) - (1+cot^2 x)
= tan^2 x - cot^2 x

ii) y = arccosx
cosy = x
sin(90 - y) = x
90 - arcsinx = y

iii) arccosx + arcsinx = y + (90 - y)
= 90

i think

Reply 1354

King_Arthur

Original post by YingYang

i) LHS = sec^2 x - cosec^2 x
= (1+tan^2 x) - (1+cot^2 x)
= tan^2 x - cot^2 x

ii) y = arccosx
cosy = x
sin(90 - y) = x
90 - arcsinx = y

iii) arccosx + arcsinx = y + (90 - y)
= 90

i think

seems perfect except they ask in pie so answer to iii) is pie/2

Reply 1355

im so fresh

Original post by YingYang

i) LHS = sec^2 x - cosec^2 x
= (1+tan^2 x) - (1+cot^2 x)
= tan^2 x - cot^2 x

ii) y = arccosx
cosy = x
sin(90 - y) = x
90 - arcsinx = y

iii) arccosx + arcsinx = y + (90 - y)
= 90

i think

how did you get to sin(90-y) from cosy?