Edexcel C3,C4 June 2013 Thread

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Yes, in that you have to divide it through before splitting into partial fractions or create 3 fractions, as justinawe showed me earlier - I tend to divide through! Doing partial fractions normally don't work on that kind of fraction :smile:

Awesome thanks very much mate :biggrin:

Reply 4741

Mallika

What's the hardest C4 paper since 2000? (I can't remember when our spec started :P )

Reply 4742

otrivine

Original post by Fortitude

That would still be complicated as you'd have to cosx in terms of u?? :confused:

Practise some questions in the book to get the hang of it. :smile:

Yes will do now,

so they got

sin3xcos2x + cos3xsin2x + sin3xcos2x - cos3xsin2x

agree so far?

Reply 4743

otrivine

Original post by usycool1

Yup, I am

All the best of luck :smile:

Even though I dont think you need it :wink:

Reply 4744

Zaphod77

Original post by Mallika

What's the hardest C4 paper since 2000? (I can't remember when our spec started :P )

June 2005 and January 2008 have the lowest grade boundaries :smile:

Reply 4745

Fortitude

Original post by kuku2013

is there any specific soloman press paper worth doing that may help in exam or shell I just do all of them?

All of them :eek:

The exam's tomorrow are you Sonic??

Reply 4746

Frankster

Original post by Story

Would it be -1/3(3x+1)^-4 ?

it should be:

-1/3(3x+2)^-4

think you just misread the original equation lol, you've got the fundamentals correct :smile:

(edited 10 years ago)

Reply 4747

Story

Original post by Zaphod77

You could be, you can use a substitution to do that or do it by inspection. Your second question, if you have an improper fraction I tend to divide through (long division) so then you get a number and a remainder, which will be over the original denominator. The remainder can then be split into partial fractions, which you can do either through comparing coefficients when you've set up the A and B fraction or through eliminating them (e.g. if the fraction included A(x+2) you can let x=-2 to eliminate A and just leave B). Does that answer your question at all?

Right, if instead of long division you can use the alternative comparing coefficient method first right? and then use it again to find the values or use the sub in method like you said.

Reply 4748

Story

Original post by Frankster

it should be:

-1/3(3x+2)^-4

Thats what I meant, typo mistake! Thank you.

Reply 4749

Dijaaa

Question:
What's the HARDEST c4 paper you've ever done? Or just a list of the most hardest ones, doesn't matter what exam board really. Thanks :smile:

Reply 4750

sonyeric33

Original post by Fortitude

All of them :eek:

The exam's tomorrow are you Sonic??

I did 8 yesterday my head actually exploded, i had to have an head implant.

Reply 4751

kuku2013

Original post by Fortitude

All of them :eek:

The exam's tomorrow are you Sonic??

I can do them trust me just tell me which ones. its takes me an hour each paper but might leave all the easy questions

Reply 4752

Fortitude

Original post by otrivine

Yes will do now,

so they got

sin3xcos2x + cos3xsin2x + sin3xcos2x - cos3xsin2x

agree so far?

yep

Reply 4753

kronca

Original post by Chris-69

I mean if it's top heavy, would you do for example:

A + B/(x+1) + C(x+2)

Reply 4754

usycool1

Original post by otrivine

All the best of luck :smile:

Even though I dont think you need it :wink:

Thanks, good luck to you too! :biggrin:

Ha, I'm sure I will need it. :tongue:

Reply 4755

girlikemoixx

found this on a solomon paper and i did it the normal way but i didnt get the right answer

4. The points A and B have coordinates (3, 9, −7) and (13, −6, −2) respectively.
(a) Find, in vector form, an equation for the line l which passes through A and B. (2)
(b) Show that the point C with coordinates (9, 0, −4) lies on l. (2)
The point D is the point on l closest to the origin, O.
(c) Find the coordinates of D. (4)
(d) Find the area of triangle OAB to 3 significant figures. (3)