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# AQA A2 Mathematics MPC4 Core 4 - 9th June 2015 [Discussion & unofficial markscheme] watch

Which past paper is this??
I'm not sure which past paper that was from, but there was a very similar question on the June 2013 paper - Q2
2. (Original post by Jimmy20002012)
Yes four, it's gonna drain me. Got core 4, chem 4, physics 4, and mechanics

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I've got 3 exams! Core 4 tuesday, f324 chemistry wednesday and g494 physics thursday!
3. As requested by many people over the last few weeks, I have decided to create AQA M1 and S2 threads which have not yet been created. The new threads are here, feel free to ask any questions if you need help:
4. hey guys i was doing a question and got stuck.... could you help?

if cosA=3/5 and sinB=5/13, where A is acute and B is obtuse, find the exact value of..

1) cos(A+B)

2) tan(A-B)

3) sin(A+B)

really frustrated at that obtuse thing, any help?

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5. (Original post by CD223)
In terms of numbers of marks this is interesting

Attachment 421053

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You got the answer for that?

I could only find
hey guys i was doing a question and got stuck.... could you help?

if cosA=3/5 and sinB=5/13, where A is acute and B is obtuse, find the exact value of..

1) cos(A+B)

2) tan(A-B)

3) sin(A+B)

really frustrated at that obtuse thing, any help?

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Here you go basically you take the negative value of the obtuse angle as the acute: see my working here is it correct?? :/
7. (Original post by ubisoft)
You got the answer for that?

I could only find
I did this and found both solutions. square root of 2 is +/- root 2
does this help?
8. If you have to put an equation into Cartesian form do you have to rearrange to get y on it's own or can you leave x's and y's on same side?
9. -1/12

?
10. Hi, took a while to find the pic as my book is ripped up

Basically I used the cast but i don't understand properly??!!! To find the obtuse one? What about if they put reflex? Thanks dude

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Attached Images

11. Hi guys when I put in
12. Hi guys when I put in ×=-0.1 I got root5/2 (Q4)

So multiplied the number I got by 2 but I'm getting 2.215 instead of 2.23 any help?

Also out of all topics this is the one that always seems to stump me along with trig identities but any tips on how to approach these binomial questions???

Exams in 2 days[s]facepalm

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Attached Images

13. Why are the Jan. grade boundaries so much higher than all the June ones? They're like 10 marks different

Also what's the highest grade boundaries that a Summer Core 4 exam has ever been? Thanks in advance to anyone who answers
14. (Original post by ubisoft)
You got the answer for that?

I could only find

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15. (Original post by ubisoft)
-1/12

?

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16. Nice, can't believe I'm getting them correct aha

You got any more 6+ markers?
17. Hi do you have any resources that explain all this stuff properly my idea is that when it's obtuse it's the same angle but the cosine and tan are negative as the X axis is going in the other direction???? What about obtuse I think that might come up!!!!

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18. Anyone have any tips on how to put together differential equations? Always get them wrong
19. (Original post by ubisoft)
Nice, can't believe I'm getting them correct aha

You got any more 6+ markers?

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20. I got up to the equation of the normal but don't understand what to do after? Do you mind explaining?

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