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# The Edexcel C3 (14/06/12 - AM) Revision Thread Tweet

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IMPORTANT: You must wait until midnight (morning exams)/4.30AM (afternoon exams) to discuss Edexcel exams and until 1pm/6pm the following day for STEP and IB exams. Please read before posting, including for rules for practical and oral exams. 28-04-2013
1. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by arvin_infinity)
convert all cot to 1/tan
then basically use double angle identity for tan2x
you should get a quadratic
then solve the quadratic
in this domain -π/2<x<π/2 my ans. are π/4 and -1.03

quote me if the method is still not clear
can you not do straight way saying lets consider the cotx=y then solve it with ys then get the anwers and convert the cot to 1/tan? and get values?
2. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by ViralRiver)
x.

You know when we sketch functions ..are we supposed to sketch the f(x) and also sketch the function required!

It's actually more work if you include the actual function cuz say you transform the function e.g. f(2x) you need to stretch the func. and show how is different to the actual function.

please quote me on that
3. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by otrivine)
can you not do straight way saying lets consider the cotx=y then solve it with ys then get the anwers and convert the cot to 1/tan? and get values?
yh why not..but try it and see if you get the ans. above (let's hope my ans. are the right ans.)
4. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
Is there a booklet which has C3 questions from old papers all together?
5. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by arvin_infinity)
yh why not..but try it and see if you get the ans. above (let's hope my ans. are the right ans.)
I AM getting in degrees 128,38??

did you get
1/4tanx=1?
then tanx=1/0.25

tanx=4
then find the degrees then +180
then divide by 2>?
6. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by arvin_infinity)
You know when we sketch functions ..are we supposed to sketch the f(x) and also sketch the function required!

It's actually more work if you include the actual function cuz say you transform the function e.g. f(2x) you need to stretch the func. and show how is different to the actual function.

please quote me on that
I didn't lose any marks for just showing the final result when I took the paper. If in doubt, or you think you'll make a mistake, start with f(x) and draw graphs for each consequent transformation.
7. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by ViralRiver)
I didn't lose any marks for just showing the final result when I took the paper. If in doubt, or you think you'll make a mistake, start with f(x) and draw graphs for each consequent transformation.
Yh I didn;t loose any mark neither ..so am gonna go with "ONLY showing the results"
8. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by arvin_infinity)
Yh I didn;t loose any mark neither ..so am gonna go with "ONLY showing the results"
I AM getting in degrees 128,38??

did you get
1/4tanx=1?
then tanx=1/0.25

tanx=4
then find the degrees then +180
then divide by 2?
9. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by otrivine)
I AM getting in degrees 128,38??

did you get
1/4tanx=1?
then tanx=1/0.25

tanx=4
then find the degrees then +180
then divide by 2>?
You got it wrong..try again ..my ans. was like tanx=1 and tanx=-5/3

EIDT:I think I got it wrong too..!!! am gonna do it again lol
Last edited by arvin_infinity; 04-06-2012 at 12:54.
10. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by arvin_infinity)
You got it wrong..try again ..my ans. was like tanx=1 and tanx=-5/3
did you get a 1/4
i did 3y+y=1
4y=1
y=1/4
right or wrong?
11. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by otrivine)
did you get a 1/4
i did 3y+y=1
4y=1
y=1/4
right or wrong?

checked mine again..it's right..only π/4 is not going to be a valid ans. just cuz tan(2* π/4 ) is not defined.
12. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by arvin_infinity)
checked mine again..it's right..only π/4 is not going to be a valid ans. just cuz tan(2* π/4 ) is not defined.
right so you cannot consider them as y can you please show me how you did? is this meant to be the harderst question
13. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
please help it will be really appriciated and i will +ve rep

thanks

and please quote me when you answer

thanks again
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14. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
Quick question guys: Chapter 6, we don't seriously have to memorise all those graphs, do we?
15. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by knowledgecorruptz)
Quick question guys: Chapter 6, we don't seriously have to memorise all those graphs, do we?
haha sorry mate you have to memorise all those graphs they ask translations and stuff from there i remember doing one or two in a solomon paper
16. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by 99llewellyn99)
haha sorry mate you have to memorise all those graphs they ask translations and stuff from there i remember doing one or two in a solomon paper
OHMYGOD...it's now like they're particularly complex or anything but what the hell's the point!?
17. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by knowledgecorruptz)
Quick question guys: Chapter 6, we don't seriously have to memorise all those graphs, do we?
Like which graph? as in exponential and ln and etc ?
Dont have the textbook so not sure

(Original post by The Anomaly)
please help it will be really appriciated and i will +ve rep

thanks

and please quote me when you answer

thanks again
you know you have to find R and convert it to the formula which you obtained perhaps in the previous parts of the same questions..if you post the value of R and the statement of R(cos ...) I should be able to tell you why

(Original post by otrivine)
right so you cannot consider them as y can you please show me how you did? is this meant to be the harderst question
Doubt it..there are harder ..well it's just because comes up once ..makes it harder
post your working I should be able to say where you got wrong
18. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by arvin_infinity)
Like which graph? as in exponential and ln and etc ?
Dont have the textbook so not sure

you know you have to find R and convert it to the formula which you obtained perhaps in the previous parts of the same questions..if you post the value of R and the statement of R(cos ...) I should be able to tell you why

Doubt it..there are harder ..well it's just because comes up once ..makes it harder
post your working I should be able to say where you got wrong
did you get a 1/4
i did 3y+y=1
4y=1
y=1/4
right or wrong?
19. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by knowledgecorruptz)
Quick question guys: Chapter 6, we don't seriously have to memorise all those graphs, do we?
You have to learn the general shape of the e^x, ln(x) graph as well as the shapes of the sin(x), cos(x), tan(x), sec(x), cosec(x) and cot(x) graph.

I did see a question which wanted you to draw what 2sec(2x) would look like.

You know that the graph would begin at y=2 because of the 2sec(2x) part

Then you know that the graph has to repeat twice at 0 < x < pi because of the 2sec(2x) part
20. Re: The Edexcel C3 (14/06/12 - AM) Revision Thread
(Original post by James A)
You have to learn the general shape of the e^x, ln(x) graph as well as the shapes of the sin(x), cos(x), tan(x), sec(x), cosec(x) and cot(x) graph.

I did see a question which wanted you to draw what 2sec(2x) would look like.

You know that the graph would begin at y=2 because of the 2sec(2x) part

Then you know that the graph has to repeat twice at 0 < x < pi because of the 2sec(2x) part
Just learnt them, they looked really intimidating at first so I got a little worried...they're pretty straightforward. Can I just ask, how general is "general"? I know the rough shape, I mean they're not looking for an accurate gradient of the curve, are they?

And if you draw a dodgy curve (like I did in C1, haha), you'd still get the marks as long as the vague shape's there, and you've got all the important points labelled, right? The co-ordinates are the main bit.
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