Year 12s: what will be the first way you research your future options? >>

Edexcel C3,C4 June 2013 Thread

Scroll to see replies

Reply 4980

justinawe

Original post by SortYourLife

Surely it's cos4A = 1 - 2sin^2 2A ? :s

Posted from TSR Mobile

That's the same thing. I posted the general formula in its simplest form.

Reply 4981

Zytex

Original post by ACBLISS

yo i got a question for you, how do i know if something is an overestimate or underestimate?

If talking about trapezium rule:

If the tops of the trapezia are above the curve, there is an overestimate, and if the trapezia are below the curve, it is an underestimate.

Reply 4982

ACBLISS

Original post by justinawe

x^{3e^{x^2}}

nope lol give up :tongue:

Reply 4983

MathsNerd1

Original post by ACBLISS

yo i got a question for you, how do i know if something is an overestimate or underestimate?

Is this when using the trapezium rule?

Reply 4984

Kreayshawn

can someone tell me what shapes we need to know the area/volume of?
i've asked a few times but no response, don't wanna have to skip a whole question on the exam because i don't know the area/volume of something basic

Reply 4985

kuku2013

Original post by Jullith

Hope this helps:

C4 8.png

hey thanks, I don't understand from the 5th step!! why do you have to make it all into ln(2)?

Reply 4986

justinawe

Original post by ACBLISS

nope lol give up :tongue:

I'm asking you what the question is, just so you know. That's not my answer :tongue:

Reply 4987

ACBLISS

Original post by MathsNerd1

Is this when using the trapezium rule?

yupp

Reply 4988

nukethemaly

Original post by Riley F.

Will we need to be able to sketch the graphs of parametric equations???

In the specification it specifies that we are not expected to sketch graphs of parametric equations but it's Edexcel so better be on the safe side!

Reply 4989

A19XI4B

Original post by James A

My Edexcel brahs, I hope the exam goes well for you lot tomorrow.

I highly doubt you would get a paper like C3. Just smash this paper and you have your A in the bag :tongue:

Thanks brah. :biggrin:

Reply 4990

ACBLISS

Original post by justinawe

Is that:

x^3 e^{x^2}

x^{3^{e^{x^2}}}

Or something else?

oops the first one :tongue:

Reply 4991

President M.E.

Good luck guys, time to freaking dominate C4 and get them grades for uni!

Reply 4992

MathsNerd1

Original post by ACBLISS

yupp

It seems to have been already answered above by someone else :tongue:

Reply 4993

Rayquaza

Original post by nm786

Hint:

sin^2xcos^2x =( \frac{1}{2}sin2x )^2

Still stuck :/

Reply 4994

hilo36

What is everyone doing for last minute C4 revision? I feel as though ive covered everything but does anyone have any ideas of good things to quickly look over ? :frown:

Please help - starting to panic

Reply 4995

SortYourLife

Original post by justinawe

No, it doesn't work that way.

\cos 2A = 1 - 2\sin^2 A

This is for all A. In this case, subbing in A=2t gives:

\cos 4t = 1 - 2\sin^2 2t

Original post by TeddyBasherz

I swear cos2A = 1-2sin^2A?

Original post by justinawe

Yes, that's right. typo, my bad. Thanks for that :tongue:

but then isnt this wrong? :s-smilie:

EDIT nevermind, i read it wrong :')

(edited 10 years ago)

Reply 4996

MathsNerd1

Original post by ACBLISS

oops the first one :tongue:

If its differentiation then its rather straightforward, I'll have to think a little for integration though.

Reply 4997

zzz.

Original post by James A

My Edexcel brahs, I hope the exam goes well for you lot tomorrow.

I highly doubt you would get a paper like C3. Just smash this paper and you have your A in the bag :tongue:

alot of people are saying the c4 paper is gnna be worse than the C3 ppr!!! :frown:

But your comment made me happy.. What makes you think that though?? :smile:

Reply 4998

MathsNerd1

Original post by hilo36

What is everyone doing for last minute C4 revision? I feel as though ive covered everything but does anyone have any ideas of good things to quickly look over ? :frown:

Please help - starting to panic

Just remain calm as if you've covered everything then that's all you can do, now getting a good nights rest before the exam would be very advisable by myself as you'll be both physically and mentally prepared :smile:

Reply 4999

ACBLISS

Original post by MathsNerd1

If its differentiation then its rather straightforward, I'll have to think a little for integration though.