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Edexcel A2 C4 Mathematics June 2015 - Official Thread

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Reply 1740

vincentjack

Original post by Moniii16081997

Need help on part d

what have you tried?

btw you can screenshot on a mac using command-shift-4

Reply 1741

Ripper Phoenix

Original post by AffirmedCube

Obviously in parts (e.g.- (a) (b), etc.). Nonetheless, I'd say this is pretty feasible. Considering vectors has come up frequently, knowing Edexcel I'd say it won't make up as much of the paper as it has previously (or so I secretly hope cos vectors iz not good)... But we'll never know, I guess lol.

Spoiler

haha!! yeah man can't wait for this to be over! Edexcel and their unpredictable nature! :biggrin:

Reply 1742

Maham88

Original post by ember8

wow, ive never had to use sina +sinb before as ive only been doing edexcel papers till now, thankyou, really appreciate that! do you think thatll come up?

no problem , i actually dont know if it would come ive havent seen any questions like this . At least you know how to do it now

Reply 1743

username1042689

Original post by Moniii16081997

Need help on part d ImageUploadedByStudent Room1434400736.702222.jpg

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think dot product

Reply 1744

H0PEL3SS

Original post by Bustamove

UCL for economics
A* emphasis on maths... I've definitely not met that criteria..
I can only hope that I get AAA and a very high UMS in maths.. maybe they'll still take me...

Ah, yeah, UCL specifically ask for maths.
I suppose with the C3 exam being the way it was, they'll be somewhat lenient.

Reply 1745

Moniii16081997

Original post by vincentjack

what have you tried?

btw you can screenshot on a mac using command-shift-4

I know that OD. AB = 0
And I made the line which passes through AB = OD. I equated the coefficients of i, j, and k.

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Reply 1746

tazza ma razza

Original post by Bustamove

UCL for economics
A* emphasis on maths... I've definitely not met that criteria..
I can only hope that I get AAA and a very high UMS in maths.. maybe they'll still take me...

I got UCL economics as well as my firm!

You sitting S4 as well by any chance? I got that first then c4 :/ gonna probs die after tomorrow :smile:

Reply 1747

manlikem

would they ask us to prove the parts formula?

Reply 1748

Bustamove

Original post by tazza ma razza

I got UCL economics as well as my firm!

You sitting S4 as well by any chance? I got that first then c4 :/ gonna probs die after tomorrow :smile:

no sorry

good luck on your exams tomorrow... :smile:

Reply 1749

ember8

Original post by Maham88

no problem , i actually dont know if it would come ive havent seen any questions like this . At least you know how to do it now

so if it was say cos3xsinx, or sin3xsinx, what would the formula look like? as in, is it always sina +sinb?

Reply 1750

Bustamove

Original post by H0PEL3SS

Ah, yeah, UCL specifically ask for maths.
I suppose with the C3 exam being the way it was, they'll be somewhat lenient.

tbh, that C3 exam wasn't that hard... I don't know what came over me in the exam... maybe it was lack of sleep or something, but after comparing my answers with Arseys.. I made some ridiculous stupid mistakes... I know the grade boundaries for an A will be somewhere between June 13 -14... I don't think it will fall that much from june 2014 tbh... Arsey predicts 57 ums for an A.. I pray that his prediction is correct...

Reply 1751

kdevitto

Does anyone have a guide or a way of thinking on how to tackle differential equations? When I've started them I'm fine I just find it hard to know where to start? Thanks :smile:

Reply 1752

Kevin De Bruyne

Original post by tazza ma razza

I got UCL economics as well as my firm!

You sitting S4 as well by any chance? I got that first then c4 :/ gonna probs die after tomorrow :smile:

Cool offer!

Last year, I had S4 straight after D1. Slightly less taxing than S4/C4 combined, but I feel your pain.

Good luck! :smile:

Reply 1753

physics_maths7

Original post by Moniii16081997

Need help on part d ImageUploadedByStudent Room1434400736.702222.jpg

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I haven't done the question but could you not also find the angle between OD and OC using the answer from part c? Just a suggestion i dont know if it would help

Reply 1754

math42

Original post by 11234

should I visualise 3d vectors in 2d? Would it still work??

Usually shouldn't be a problem; if it's only lines you don't really need to visualise cos it's all algebra
If it's a geometrical question they always focus on a single plane for 2d shapes anyway so you can draw a 2d diagram and think of everything in 2d

Reply 1755

Dalliance

Original post by 11234

should I visualise 3d vectors in 2d? Would it still work??

It should yes; either way it's much more effective than trying to use mental maths lol. Also, if something seems not right with your diagram, you can prob look at your data and kind of figure out what's wrong.

Reply 1756

math42

Original post by Moniii16081997

Need help on part d ImageUploadedByStudent Room1434400736.702222.jpg

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The coordinates of D satisfy two equations
The general equation of the line and the appropriate dot product = 0

Reply 1757

anonwinner

Original post by Bustamove

I hope so too

Reply 1758

jubilant_joej

Partial fractions:
If the fraction is top heavy by one degree, e.g has x^3 on top and x^2 on bottom, then it can be expressed in the form Ax + B + C/denominators - is this correct?

Reply 1759

maccisha

Original post by AffirmedCube

Any good links where I can quickly go over and learn everything I need to know about vectors including:
- How to prove intersection
- When it is parallel/perpendicular
- Reflection in the line
- Everything else

Really hope vectors isn't a large feature of tomorrow's paper. I am struggling with dat shiz!