Edexcel C3,C4 June 2013 Thread

The fx-991es lets you work out the value of an integral between limits. It can't tell you what the actual integrals is in terms of the variables, but it can tell you, for example, what the value of

\displaystyle\int^2_0 2x\ dx

is

What about with trig ?function

I mean with integration is there ways you can check if u are correct?

Reply 1861

MedMed12

21

Original post by ACBLISS

They are going fine dw lol :smile:

I need to crack on with eco :/

good good

when is the eco exam? You have two, right?

Reply 1862

BobLoblawLawBlog

16

Original post by otrivine

What about with trig ?function

I mean with integration is there ways you can check if u are correct?

Do you mean integration with trigonometry? If so, then yeah, you can do most integrals, but it doesn't always give exact answers. So if you typed in the calculator

\displaystyle\int^\frac{\pi}{2}_0 cosx\ dx

it will display '1' on the screen.

In terms of checking, I usually do the integral on the calculator (I either make up some limits if none are given in the question, or I use the ones in the question). But if I can see another way of doing the integral (e.g. by parts or using standard forms), then I will often try that as well.

(edited 10 years ago)

Reply 1863

nm786

2

For Question 5 June 2011 i'm not sure why y=16 i know if you sub in x=2 you get 4ln2 which is ln16 but why do you need to take e^ln16 to get y=16?

(edited 10 years ago)

Reply 1864

usycool1

19

Original post by nm786

For Question 5 June 2011 i'm not sure why y=16 i know if you sub in x=2 you get 4ln2 which is ln16 but why do you need to take e^ln16 to get y=16?

Because you have ln y = something

not y = something

:smile:

Reply 1865

nm786

2

Original post by usycool1

Because you have ln y = something

not y = something

:smile:

PRSOM oh yeah, thanks :biggrin:

Reply 1866

kronca

if your method doesnt follow the MS how will they know how to allocate the M1/B1/A1 marks?

Reply 1867

KD35

15

Hey guys.

I think we should start stating important points from the examiner reports that you need to include to pick up points.

I'll go first.

Quote the product or quotient rule whenever using it.

Reply 1868

nm786

2

give answers to 3sf unless stated otherwise :biggrin:

(edited 10 years ago)

Reply 1869

nukethemaly

11

When doing integration using trig, quote the trig identity used?

Reply 1870

nukethemaly

11

Original post by kronca

if your method doesnt follow the MS how will they know how to allocate the M1/B1/A1 marks?

They usually have alternatives shown in the mark scheme.

Reply 1871

ACBLISS

Original post by MedMed12

good good

when is the eco exam? You have two, right?

tuesday is my unit 3 exam, erm i think my theory is fine? Going to start past papers and just like go over knowledge? lol
Unit 4 is 2 days before c3/s3 :tongue:

Reply 1872

BobLoblawLawBlog

16

In vectors, if they ask for the co-ordinates of a point P, give the co-ordinates of P and not the vector.

(edited 10 years ago)

Reply 1873

Better

OP

8

Woops I almost forgot myself - Everyone don't forget

EXAM SOLUTIONS http://www.examsolutions.net

Just as a reminder to everyone else if you've done the Solomon Papers don't forget about Exam Solutions for when you've moved on to the Real Papers.

He's got all the videos for 2007-2013 so hopefully we won't get people asking the same questions twice and we will only see the hardest questions here.

Reply 1874

MedMed12

21

Original post by brittanna

In vectors, if they ask for the co-ordinates of a point P, give the co-ordinates of P and not the vector OP!

but on june 05, it asks for PV D but the mark scheme says OD :/ isnt it the same :s-smilie:

Reply 1875

BobLoblawLawBlog

16

Original post by MedMed12

but on june 05, it asks for PV D but the mark scheme says OD :/ isnt it the same :s-smilie:

If it asks for the position vector, then that's fine. But sometimes they ask for coordinates. So you would have to write

(a,b,c)

rather than

\begin{pmatrix} a \\ b \\ c \end{pmatrix}

Reply 1876

KD35

15

As silly as it may sometimes seem, for show thats, you need to include nearly every step.

One I can remember is on C3 where you've got an expression like 25cos(x-45) + 5

And it asks you for the maximum value,
You need to put 25+5, the answer on it's own didn't get full marks in one paper.

Reply 1877

masryboy94

8

one thing i've learnt is DON'T GET CHEEKY. the amounts of times i missed out a few lines of working because i thought i can do it in my head, and then i come to realise i did STUPID mistakes like thinking 3 x 2 = 5 which then becomes pretty hard to spot when you have 2/3 pages of calculations; costing me priceless marks (because there are so many numbers around you get confused-ish), which in fact lost me the grade i wanted in C3 in Jan. so my advice is, put your pen to paper for an extra 5 seconds to write up something as simple as 3 x 2 = 6 that will actually make sure you don't lose the marks :smile:

Reply 1878

Better

OP

8

Original post by masryboy94

one thing i've learnt is DON'T GET CHEEKY. the amounts of times i missed out a few lines of working because i thought i can do it in my head, and then i come to realise i did STUPID mistakes like thinking 3 x 2 = 5 which then becomes pretty hard to spot when you have 2/3 pages of calculations; costing me priceless marks (because there are so many numbers around you get confused-ish), which in fact lost me the grade i wanted in C3 in Jan. so my advice is, put your pen to paper for an extra 5 seconds to write up something as simple as 3 x 2 = 6 that will actually make sure you don't lose the marks :smile:

Thanks for the tip!

Reply 1879

MedMed12

21

Original post by ACBLISS

tuesday is my unit 3 exam, erm i think my theory is fine? Going to start past papers and just like go over knowledge? lol
Unit 4 is 2 days before c3/s3 :tongue:

hmm just do lots of past papers- chances are something from 2010-11 may creep up again. I think for eco its also to do with the style of writing maybe, thats the impression I get when my friends discuss eco and I haven't the foggiest what they are talking about :tongue:

ohh unlucky- clash or 1 morning or afternoon?

Edexcel C3,C4 June 2013 Thread

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