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AEA Mathematics 25/06 2013 Thread watch

• View Poll Results: What do you think the Distinction grade boundary is likely to be?
Greater than 85
1
2.70%
82-85
5
13.51%
78-81
4
10.81%
74-77
9
24.32%
70-73
7
18.92%
66-69
10
27.03%
65 or less
1
2.70%

1. (Original post by yl95)
I got 7 solutions or something for theta...looks like it's a fail for me.
Oh... I think this sounds right actually. I got one solution as being something like 3Th = 54+360n and the other as Th=70, and forgot to subtract from 180 degrees or whatever it should have been so I probably missed a few solutions.
2. (Original post by Math-Magician)
The expansion would be valid, but (1+aX)^1 = 1+aX, and (1+aX)^0 = 1, so they both give no X^2 or X^3 terms and I'm sure the question said the coefficients of these were non-zero? The next part then asked you to reject one of the other two solutions (as they told you X=1/2 and this made mod(aX)>1)

I definitely got 5/2 and -1/2 though so that's good!
I'm pleased if you got four solutions for theta as I thought I'd included spurious solutions or something, it looked like there were too many

I must have dropped 20-30 marks or so on this paper, plus all the style marks no doubt
aaah I missed the non-zero part. I'm confused about trig solutions will need to double check, I think I may have had more than 4,was it x+17
x+8?
I'm hoping I didn't drop more than 30
3. (Original post by jarasta)
aaah I missed the non-zero part. I'm confused about trig solutions will need to double check. was it x+17
x+8?
That rings a bell, but I have no idea about the actual answers, I just made up some numbers before to show what I did wrong!

Plot the two graphs on the computer and see where they cross if you want to be sure.
4. I got 16 degrees for one of my theta values, I think...
5. (Original post by Math-Magician)
Oh... I think this sounds right actually. I got one solution as being something like 3Th = 54+360n and the other as Th=70, and forgot to subtract from 180 degrees or whatever it should have been so I probably missed a few solutions.
Yeah I had the initial solution, y+360n
the (180-y)+360n
6. (Original post by yl95)
I got 16 degrees for one of my theta values, I think...
yeah I came out with 16.
Ill show what I did
2sin(x+17)=cos(x+8)/cos(x+17)
2sin(x+17)cos(x+17)=sin(90-(x+8))
sin(2x+34)=sin(82-x)
so 2x+34=82-x... find 3x. then +360n divide by 3
then 180-3x+360n, divide by 3
7. Oh, I did +180n...ugh.
8. (Original post by jarasta)
yeah I came out with 16.
Ill show what I did
2sin(x+17)=cos(x+8)/cos(x+17)
2sin(x+17)cos(x+17)=sin(90-(x+8))
sin(2x+34)=sin(82-x)
so 2x+34=82-x... find 3x. then +360n divide by 3
then 180-3x+360n, divide by 3
I just did it on an online graphing calculator and it looks like there should be 3 solutions

Oops, I forgot to put it into radians, I'm getting Theta = 16, 64, 136, 256 using the first line of your post.

Try it on here but remember to put it into radians first:
https://www.desmos.com/calculator
9. Oh no! How much would I be penalised for extra solutions using +180n?
10. (Original post by Math-Magician)
I just did it on an online graphing calculator and it looks like there should be 3 solutions

Oops, I forgot to put it into radians, I'm getting Theta = 16, 64, 136, 256 using the first line of your post.

Try it on here but remember to put it into radians first:
https://www.desmos.com/calculator
I got 4 from the graph, if i put the right things in and I remember getting those numbers
Did anyone have a complete solution to the series one, not to double check what I did
11. My brain was utter mush, I don't think I managed to finish any of the final parts. No distinction for me.
12. (Original post by Appeal to reason)
My brain was utter mush, I don't think I managed to finish any of the final parts. No distinction for me.
Im thinking that the grade boundaries for a distinction might be closer to 70 than 80 this year given that a lot of people who would otherwise have scored well will have sat STEP first and then done worse in the AEA.
14. (Original post by Math-Magician)
Im thinking that the grade boundaries for a distinction might be closer to 70 than 80 this year given that a lot of people who would otherwise have scored well will have sat STEP first and then done worse in the AEA.
I hope so, or that Warwick will take me with a merit given I get the A-levels grades I'm hoping for. A guy from last year got in with a Merit, so fingers crossed!
15. (Original post by jarasta)
I hope so, or that Warwick will take me with a merit given I get the A-levels grades I'm hoping for.
Didn't you take STEP I yesterday? I'm sure you'll have done enough to get into Warwick
16. When are we allowed to talk about STEP?
17. (Original post by Math-Magician)
Im thinking that the grade boundaries for a distinction might be closer to 70 than 80 this year given that a lot of people who would otherwise have scored well will have sat STEP first and then done worse in the AEA.
Its been close to 70 nearly every year?
18. (Original post by Math-Magician)
When are we allowed to talk about STEP?
I think its 1pm
19. (Original post by Appeal to reason)
Its been close to 70 nearly every year?
Oh really? Maybe it'll go even lower

(Original post by MathsNerd1)
I think its 1pm

Ah, thanks. I'm going out so I have to wait until later.
20. (Original post by MathsNerd1)
I think its 1pm
Ah, thanks. I'm going out so I have to wait until later.

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