## MATHS EXAM 2005 discuss answers etc.

### lanky_182

Posted 20 May 2005 - 12:28 PM

QUOTE(gary @ May 20 2005, 12:27 PM)
I never got that then don't see how sin comes into it.

me either

### coca

Posted 20 May 2005 - 12:28 PM

QUOTE(gary @ May 20 2005, 01:27 PM)
I never got that then don't see how sin comes into it.

I used sin to calculate the angle between A and C

### gary

Posted 20 May 2005 - 12:29 PM

I don't get that I thought seeing as it said BC was perpendicular then it would be 90-60 for the angle.

### gary

Posted 20 May 2005 - 12:31 PM

Share your paper one answers.

### Colin

Posted 20 May 2005 - 12:31 PM

I cant remember much from paper1.

3(a) i got F(10,5,0) i think. and (b) AF (2,5,0)

Ithink this is what i got( it may not be though)

### coca

Posted 20 May 2005 - 12:31 PM

QUOTE(gary @ May 20 2005, 01:29 PM)
I don't get that I thought seeing as it said BC was perpendicular then it would be 90-60 for the angle.

Bah. Who knows!

### e-unit

Posted 20 May 2005 - 12:39 PM

[right][/right]
[/quote]

Bah. Who knows!
[right][/right]
[/quote]
I do!!!! mwahahaha!!!!!

why did u not just do a.a+a.b+a.c? Or maybe you did and in that case i don't know how sin comes into it. Damn!

### herbeey

Posted 20 May 2005 - 12:42 PM

a.b is 0
a.a is a squared.
a.c is essentially a.a, since they are same length.

### e-unit

Posted 20 May 2005 - 12:46 PM

QUOTE(herbeey @ May 20 2005, 01:42 PM)
a.b is 0
a.a is a squared.
a.c is essentially a.a, since they are same length.

Wrongo! a.a=3.3.cos0=9

a.c=3.3.cos60=3.3.(1/2)=4.5

### coca

Posted 20 May 2005 - 12:46 PM

Compare your answers with mine, tell me if I've gone wrong

(Paper 1)
1.

y = 31/2 + 2 * 31/2

2.

A) Get centres for both circles, P is the midpoint - (0,2)

B) |AB| = 10

3.

A) F = (10, 5, 3)

B) (-2, 5, 3)

### HatingHighers

Posted 20 May 2005 - 12:47 PM

Paper 1:

1. y = root3(x+2)

2)a) (0,2)
b) 10

3)a) (10,5,3)
b) -2 5 3 (in component form)

4) (3x-1)^2 + 7
b)i) (1/3, 7)
ii) h greater than or equal to 7

5) 8cosx(1+2sinx)^3

6)a) k = -1/4
b)i) u1 = 3m+5, u2 = 3m^2 + 5m + 5
ii) m = -2

7)a) a = 4, b = 5
b) x greater than 4

8. ----> didnt write answers on sheet, but stationary points were 0 and 7/3. 7/3 was irrelevant to the question so do a nature table for 0 and I found out it was a falling point of inflection. blah blah blah

9) didn't write answer on paper. first i put cos2x = 2cos squared x - 1 and worked out values for cosx. Then put cos2x intot he sin squared x formula

10)a) 2sin(x - pi/3)
b) Graph

11)a) y squared + (x-t) squared = 4
b) root 5

### KhalidBoussouara

Posted 20 May 2005 - 12:47 PM

I almost got stuck at that question with the dot product nonsense. However I then noticed the word "equilateral" which made the answer perfectly clear.

### Colin

Posted 20 May 2005 - 12:54 PM

I got the same awnser as you on Q3, my earlier post was tosh

### HatingHighers

Posted 20 May 2005 - 12:58 PM

bluh, got the maximum wrong for Q8 - 0 was the maximum point. Think I got the minimum right though, so I'll maybe only lose a couple of marks.

### *Suz*

Posted 20 May 2005 - 01:08 PM

Im not suprised i got the reccurance relations question wrong on paper 1, was very confused with that one. Also noticed a few marks here and there ive lost....ah wells, hopefully the 8 markers, 7 markers etc that i got right will balance out the odd 1 mark incorrect ones

### gary

Posted 20 May 2005 - 01:21 PM

Yes I can't believe I got the 5 mark circle question in paper 1 right. I was arguing with someone who said you didn't use the midpoint.

### jondom

Posted 20 May 2005 - 01:30 PM

I think I got a couple of marks for that then since I managed to expand it etc.

### Kirsty

Posted 20 May 2005 - 02:03 PM

I didn't think those papers were as hard as some past papers I'd already done - missed out 11 marks in the paper 1 and 11 marks in paper 2 - oh, and btw, my mum works at SQA and wouldn't tell me anything that was in the papers!

### tupacshakur

Posted 20 May 2005 - 02:13 PM

QUOTE(Kirsty @ May 20 2005, 02:03 PM)
btw, my mum works at SQA and wouldn't tell me anything that was in the papers!

is it possible to find out your results BEFORE 10th august by emailing SQA and pleading with them to let you know what you got or by asking someone u know who works there?

someone i know claimed they did that through someone they knew working there. Is it true?

### YIC

Posted 20 May 2005 - 02:15 PM

for the log question in paper 2 I wrote 43/15. Is that okay? I never thought we would have to write an approximation.....