Edexcel A2 C4 Mathematics June 2016 - Official Thread

Hi guys, lost my first account so made a new one :biggrin:

And I will be giving C3 C4 and S1 this year (GCE) :smile:

Hope it turns out good for all of us. Will be happy to help and to be helped. :smile:

Reply 1801

KINGYusuf

12

Ayyy my boy Zubairrr

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Reply 1802

Original post by KINGYusuf

Ayyy my boy Zubairrr

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Hey man whats up? :smile:

Reply 1803

Original post by KINGYusuf

Ayyy my boy Zubairrr

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Hahahha heeeey. :biggrin:

how r you?

Reply 1804

Dohaeris

3

Can someone explain the integration of sin2ysiny (no squared)?

EDIT: I figured it out, 2/3 sin(cubed)y, with help from the mark scheme. But is the only way of integrating these type of questions by imagining differentials? Or is there another method I'm missing here?

(edited 7 years ago)

Reply 1805

Original post by Dohaeris

Can someone explain the integration of sin2ysiny (no squared)?

EDIT: I figured it out, 2/3 sin(cubed)y, with help from the mark scheme. But is the only way of integrating these type of questions by imagining differentials? Or is there another method I'm missing here?

That is the quickest way of doing this integral. You can also note that Cos(3y) = Cos(2y + y) = cos2ycosy - sin2ysiny, and cos(y) = cos(2y - y) = cos2ycosy + sin2ysiny, so sin2ysiny = (cosy - cos3y)/2, so the integral is (1/2)siny - (1/6)sin3y

Reply 1806

Original post by Dohaeris

Can someone explain the integration of sin2ysiny (no squared)?

EDIT: I figured it out, 2/3 sin(cubed)y, with help from the mark scheme. But is the only way of integrating these type of questions by imagining differentials? Or is there another method I'm missing here?

This identity will be given in the pink formulae booklet.

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1463139870479.jpg24.0KB

Reply 1807

Dohaeris

3

Original post by 1 8 13 20 42

That is the quickest way of doing this integral. You can also note that Cos(3y) = Cos(2y + y) = cos2ycosy - sin2ysiny, and cos(y) = cos(2y - y) = cos2ycosy + sin2ysiny, so sin2ysiny = (cosy - cos3y)/2, so the integral is (1/2)siny - (1/6)sin3y

Original post by usman.zubair

This identity will be given in the pink formulae booklet.

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According to the mark scheme, it can be solved by integration by parts too :/ Any idea on how to do it?

Reply 1808

Original post by Dohaeris

According to the mark scheme, it can be solved by integration by parts too :/ Any idea on how to do it?

Yeah it's like a "loop" kind of thing. Just take care to choose the different functions carefully so as not to get something that cancels out to 0 and doesn't tell you anything. I'd start by letting siny be the function you first integrate and sin2y the one you first leave the same.

Reply 1809

Dohaeris

3

Original post by 1 8 13 20 42

Yeah it's like a "loop" kind of thing. Just take care to choose the different functions carefully so as not to get something that cancels out to 0 and doesn't tell you anything. I'd start by letting siny be the function you first integrate and sin2y the one you first leave the same.

Thanks for the answers mate. I think I understand it now, though just doing the original testing for differentials is indeed the easiest method.

Reply 1810

Original post by Dohaeris

Thanks for the answers mate. I think I understand it now, though just doing the original testing for differentials is indeed the easiest method.

Yeah it is. The other methods are good for if you have something like a Sin3y or Sin4y in there, something you can't instantly just express in a more manageable way.

Reply 1811

jamessmith15

2

Top 3 hardest C3 papers to date and hardest C4 Papers

Reply 1812

NotNotBatman

Original post by jamessmith15

Top 3 hardest C3 papers to date and hardest C4 Papers

Based on my scores the hardest C3 papers are:
June 2013
Jan 2014 (r)
June 14 (r)

Haven't done as many C4 papers yet, but the hardest that I've done so far is June 2007.

Reply 1813

SaadKaleem

8

Original post by NotNotBatman

Based on my scores the hardest C3 papers are:
June 2013
Jan 2014 (r)
June 14 (r)
.

Damn i gotta try June 2013 soon, then :biggrin:

Reply 1814

blessed107

9

kinda new to this, but where are u guys in terms of preparation for c4 and c3 have u guys done all the papers ? What grades have u been getting so far? And when r u guys gonna so the Solomon ones

Reply 1815

imran_

2

Hi, how would I find the domain for this question?
I understand that the domain of the inverse function is the range of the orginal function.

Im having difficulty finding the range

question 8A

https://07a69ccf283966549a9350d1a66951a7bc96e2dc.googledrive.com/host/0B1ZiqBksUHNYZ0JQM1NRcmdHdXM/January%202014%20(IAL)%20QP%20-%20C3%20Edexcel.pdf

Reply 1816

imran_

2

Original post by imran_

Hi, how would I find the domain for this question?
I understand that the domain of the inverse function is the range of the orginal function.

Im having difficulty finding the range

question 8A

https://07a69ccf283966549a9350d1a66951a7bc96e2dc.googledrive.com/host/0B1ZiqBksUHNYZ0JQM1NRcmdHdXM/January%202014%20(IAL)%20QP%20-%20C3%20Edexcel.pdf

Anyone???

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Reply 1817