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# Edexcel A2 C4 Mathematics June 2016 - Official Thread watch

1. (Original post by imran_)
75dh/dt=(4-5h)

why cant you change that to 1/75dt =1/(4-5h)dt and carry on from there?
You can/
2. (Original post by Glavien)
Ohh thank you, but is there a reason why when you integrate you get the area of the top shaded area by default?
It's a bit complicated but it kinda of has to do with the "loopiness" of the curve, if you get what I mean. When you integrate, you're only selecting one branch of the loop and finding the area of that.

What if the bottom half wasn't symmetrical to the top half but still directly underneath it, with the same limits A and B. How could you find the area of the bottom half?
This only happens when the bottom half is symmetrical to the top half (because of the squares in the parametric equations, which also causes the loopiness thing) - so if there was a curve where the bottom wasn't symmetrical to the top, you wouldn't have the issue of "intgrating only gives the top half".

You might want to watch this for some added elucidating.
3. (Original post by Zacken)
It's a bit complicated but it kinda of has to do with the "loopiness" of the curve, if you get what I mean. When you integrate, you're only selecting one branch of the loop and finding the area of that.

This only happens when the bottom half is symmetrical to the top half (because of the squares in the parametric equations, which also causes the loopiness thing) - so if there was a curve where the bottom wasn't symmetrical to the top, you wouldn't have the issue of "intgrating only gives the top half".

You might want to watch this for some added elucidating.
Thanks so much!! Sorry to be a pain, but if I was to integrate this curve w.r.t x will I got the shaded region only?

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4. (Original post by Glavien)
Thanks so much!! Sorry to be a pain, but if I was to integrate this curve w.r.t x will I got the shaded region only?
I don't think you'd be able to integrate that curve w.r.t x, let alone get areas from it.
5. (Original post by Zacken)
I don't think you'd be able to integrate that curve w.r.t x, let alone get areas from it.
Ohh cool, thanks for the help!!
6. (Original post by Zacken)
You can/
I did, but gave me the wrong answer. I tried multiple times
7. (Original post by imran_)
I did, but gave me the wrong answer. I tried multiple times
You'll need to post your working so we can see what went wrong.
8. Will I be allowed to use the
Casio FX-991ESPLUS Scientific Calculator
for the edexcel maths exams?
9. (Original post by imran_)
Will I be allowed to use the
Casio FX-991ESPLUS Scientific Calculator
for the edexcel maths exams?
Yes, it is allowed as it cannot do Symbolic manupilation.
Yes, it is allowed as it cannot do Symbolic manupilation.
DId you sort all that out xD
11. (Original post by L'Evil Wolf)
DId you sort all that out xD
Nope, my school administration are retarded. I don't care really to be honest.
Nope, my school administration are retarded. I don't care really to be honest.
sucks bro, oh well - no point in having a good calc if you don't know how to use it etc.
Nope, my school administration are retarded. I don't care really to be honest.
This is a real problem and this is unacceptable. Zacken any idea on how he can prove to his school that the FX 991 ES is allowed? They seem too stupid to recognise symbolic manip
Nope, my school administration are retarded. I don't care really to be honest.
https://www.amazon.co.uk/Casio-FX-99...dp_ob_title_ce

It says on the page by the Casio DISTRIBUTOR that it is suitable for A-Level. Would your teachers accept this?

Here on the Casio UK website it says it's ideal for all advanced studies
15. (Original post by Student403)
https://www.amazon.co.uk/Casio-FX-99...dp_ob_title_ce

It says on the page by the Casio DISTRIBUTOR that it is suitable for A-Level. Would your teachers accept this?

Here on the Casio UK website it says it's ideal for all advanced studies
The crucial prohibitions above are to do with calculators that can perform symbolic algebra manipulation and/or symbolic differentiation or integration; these calculators are still quite expensive and the ones I know about include:
• Casio: Algebra FX2.0, Algebra FX2.0 PLUS, ClassPad 300 (all models)
• Hewlett Packard: HP 40G, HP 40GS, HP 48G, HP 48G II, HP 49G, HP 49G PLUS, HP 50G, HP Prime
• Texas Instruments: TI-89, TI-89 (Titanium), TI-92, TI-92 PLUS, Voyage 200, TI-nspire CAS.
This isn’t an official list - it’s based on what I know of these calculators and my interpretation of the JCQ rules. There is no list of calculators which can be used, though it can probably be assumed that any calculator that is not on the list above is permissible. This includes graphical calculators, those which can perform numerical differentiation and integration, manipulate matrices, change bases, and so on.
16. (Original post by samb1234)
The crucial prohibitions above are to do with calculators that can perform symbolic algebra manipulation and/or symbolic differentiation or integration; these calculators are still quite expensive and the ones I know about include:
• Casio: Algebra FX2.0, Algebra FX2.0 PLUS, ClassPad 300 (all models)
• Hewlett Packard: HP 40G, HP 40GS, HP 48G, HP 48G II, HP 49G, HP 49G PLUS, HP 50G, HP Prime
• Texas Instruments: TI-89, TI-89 (Titanium), TI-92, TI-92 PLUS, Voyage 200, TI-nspire CAS.
This isn’t an official list - it’s based on what I know of these calculators and my interpretation of the JCQ rules. There is no list of calculators which can be used, though it can probably be assumed that any calculator that is not on the list above is permissible. This includes graphical calculators, those which can perform numerical differentiation and integration, manipulate matrices, change bases, and so on.
If only his idiot teachers would listen Dammit this pisses me off
17. (Original post by Student403)
If only his idiot teachers would listen Dammit this pisses me off
It's from graham from edexcel's post about calculator's in 2015 btw, and yeah it is pretty stupid when there's literally nothing wrong with it
Nope, my school administration are retarded. I don't care really to be honest.
(Original post by Student403)
This is a real problem and this is unacceptable. Zacken any idea on how he can prove to his school that the FX 991 ES is allowed? They seem too stupid to recognise symbolic manip
Send Edexcel an email (go on their website and look for their student support email or whatevs, ask me if you can't find it) with your centre number and the issue and ask them to get in contact with your centre or to send you an email/digital letter confirming the use of your calculator. Make sure to specify the model/make/features of it and give as much information on your centre as possible.
Nope, my school administration are retarded. I don't care really to be honest.
I swear that's such a huge disadvantage. People give C34 with GDCs and you can't use a scientific.

My suggestion would be to full UMS it and show them who's boss
20. (Original post by Zacken)
Send Edexcel an email (go on their website and look for their student support email or whatevs, ask me if you can't find it) with your centre number and the issue and ask them to get in contact with your centre or to send you an email/digital letter confirming the use of your calculator. Make sure to specify the model/make/features of it and give as much information on your centre as possible.
Won't work unfortunately. If you search you can find a few people asking edexcel on twitter and facebook and they just regurgitate the pre written can't comment on specific models etc etc and just refer to that text i linked earlier with the regulations in

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