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2003 Paper 2 Question 9 - HSN forum

# 2003 Paper 2 Question 9

5 replies to this topic

### #1coca

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Posted 02 May 2005 - 09:32 PM

Argh! This one has tripped me up.
<MrBob> I hate Uni. At least in film studies we get to talk about Fight Club.
<@X-Factor> Wouldnt you be breaking the first 2 rules?

### #2Mr H

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Posted 02 May 2005 - 09:45 PM

a.(a+b)=36
a.a+a.b=36
5 + 5.4.cos =36
25+20cos =36
20cos =11
cos =11/20
=56.6

H tends 2 infinity

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### #3coca

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Posted 02 May 2005 - 09:53 PM

Oh I see! I didn't know it could multiply out like that

Thanks a lot
<MrBob> I hate Uni. At least in film studies we get to talk about Fight Club.
<@X-Factor> Wouldnt you be breaking the first 2 rules?

### #4Soph.E.

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Posted 19 May 2005 - 03:44 PM

I understand the multiplying out of a.(a.b) to get a.a=a.b and then getting

a.b = 20cos

but what's wrong with a.a = 25 cos ? Why is it just 25? Once I get this the rest is fine though

### #5eck231

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Posted 19 May 2005 - 03:50 PM

Technically it is a.a = 25cosÃ˜
as it is a straight line the cosÃ˜ is cos0

this means a.a= 25cos0

As cos0 =1 it simply becomes 25!

Hope this helps

### #6Soph.E.

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Posted 19 May 2005 - 03:56 PM

Ohhhh I get it now silly me that was kinda dumb! Thank you!

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