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# Edexcel C3,C4 June 2013 Thread watch

1. (Original post by Better)
Can anyone recommend when I should finish the C4 Papers Please?

Physics and Chemistry are taking up alot of time. I'm up to 2012 on the C3 Papers, my results thus far are pretty decent......

Would Starting the real C4 papers on Thursday be leaving it too late?
Have you done a good amount of practice for C4 yet, like Solomons and stuff? If so, starting the real C4 on Thursday should be fine, imo.
2. (Original post by AHarris)
Attachment 224201

Can anyone do part d of q15
The answer in the back is wrong but I still have no idea how to get an answer :/

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I rushed this but it's about finding limits for theta and multiplying the "y" expression by dx/d(theta) to integrate wrt theta I think
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3. For C3 trig questions (finding x)..
When im at the stage where for example: cos(2x-36.87) = 2/5
I normally write: let 2x-36.87 =b and then continue my working with cosb =2/5 as I find this easier.. Then convert it back later.

When doing this I normally just find lots of values by adding and subtracting 360.. However can someone please tell me how to change the range so that I know when to stop e.g. if it was 0 < x < 180 what would it become when I let 2x-36.87 =b?

Thanks
4. (Original post by bestfriends33)
For C3 trig questions (finding x)..
When im at the stage where for example: cos(2x-36.87) = 2/5
I normally write: let 2x-36.87 =b and then continue my working with cosb =2/5 as I find this easier.. Then convert it back later.

When doing this I normally just find lots of values by adding and subtracting 360.. However can someone please tell me how to change the range so that I know when to stop e.g. if it was 0 < x < 180 what would it become when I let 2x-36.87 =b?

Thanks
if 0 < x < 90 , -12 < B < 78 where B=x-12, you put the range boundaries in for x values.
5. (Original post by Tchombo)
if 0 < x < 90 , -12 < B < 78 where B=x-12, you put the range boundaries in for x values.
Thanks! So you just subs the range values into the equation..

So for my question above would the range become -36.87 < x <323.13?
6. Someone give me some foul questions for C3, I need to prepare for the outcome that happening in M2!

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7. (Original post by MathsNerd1)
Someone give me some foul questions for C3, I need to prepare for the outcome that happening in M2!

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It's probably not that difficult, but it's the best I could come up with .

Find . You are only allowed to use C3 methods though.
8. (Original post by Tchombo)
I rushed this but it's about finding limits for theta and multiplying the "y" expression by dx/d(theta) to integrate wrt theta I think
Did you forget to take it away from 5 at the end or am I missing something?
9. (Original post by brittanna)
It's probably not that difficult, but it's the best I could come up with .

Find . You are only allowed to use C3 methods though.
I'll try this now and post my answer for you to check? I'm sure I can already see the method though

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10. (Original post by brittanna)
It's probably not that difficult, but it's the best I could come up with .

Find . You are only allowed to use C3 methods though.
This just looks completely wrong, but who knows.

Is this correct?

Edit: This is rubbish.
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11. (Original post by brittanna)
It's probably not that difficult, but it's the best I could come up with .

Find . You are only allowed to use C3 methods though.
Ignore the last post, that's complete and utter rubbish, would this be it?

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12. (Original post by MathsNerd1)
Ignore the last post, that's complete and utter rubbish, would this be it?

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I got
Spoiler:
Show
13. (Original post by brittanna)

I got
Spoiler:
Show
Oh I had my base value wrong :-/ silly me -.-

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14. (Original post by MathsNerd1)
Oh I had my base value wrong :-/ silly me -.-

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.
15. (Original post by brittanna)

I got
Spoiler:
Show
What was your method to get this?

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16. (Original post by justinawe)
Have you done a good amount of practice for C4 yet, like Solomons and stuff? If so, starting the real C4 on Thursday should be fine, imo.
Yes mate I've finished all the Solomon for C4. Ah kk. Thanks for your input as always Justin!

Just a bit nervous whether I can finish them fine.
17. (Original post by brittanna)
It's probably not that difficult, but it's the best I could come up with .

Find . You are only allowed to use C3 methods though.
Is this C3???!

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18. (Original post by AHarris)
What was your method to get this?

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You use implicit differentiation by taking logs on both sides.

y= x^(e^x)

lny= lnx^(e^x)

lny= e^x lnx

Differentiate
Use the product rule on the RHS

1/y(dy/dx)= e^xlnx + (e^x)/x

Multiply both sides by y

dy/dx = y( e^xlnx + (e^x)/x )

replace y with x^(e^x)

I am so sorry, but I cant do the whole fancy print screens they do. Someone else can do it for you
19. (Original post by StUdEnTIGCSE)
Is this C3???!

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yes.
20. (Original post by frogs r everywhere)
yes.
Ah k.
I should go through the textbook, seem to have forgotten all the important stuff

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