You are Here: Home >< Chat >< Chat

The Soc for People of 'GRDCT2008' Mk VI watch

1. I gave natty subs in return for favours
2. You dish them out like sweets....
3. (Original post by lozz2601)
why am I putting myself through an economics retake......

anyhoo. argh.
Don't forget you can use my Tutor2u thing if you need it
4. (Original post by letsdothetimewarpagain)
I gave natty subs in return for favours
Can I get in on this?
5. (Original post by ArchedEdge)
Don't forget you can use my Tutor2u thing if you need it
omg yeh I'd forgotten about that, thank you!
6. (Original post by lozz2601)
why am I putting myself through an economics retake......

anyhoo. argh.
unit 1?
i have it tomorrow! revision just isnt happening really..
7. (Original post by jaz_jaz)
unit 1?
i have it tomorrow! revision just isnt happening really..
yupppp that's the one!
The more I look at it the more I don't know.....is yours a re-sit too?
8. (Original post by letsdothetimewarpagain)
I gave natty subs in return for favours

Beth, don't make me laugh

Spoiler:
Show
All though a sub right now or some riches would be appreciated
9. Whats life like on the sub side?
10. Someone mathsy help me.

12 cos x – 4 sin x = 7

Write down the minimum value of 12 cos x – 4 sin x.

I don't get how you figure that out?
11. (Original post by ArchedEdge)
Someone mathsy help me.

12 cos x – 4 sin x = 7

Write down the minimum value of 12 cos x – 4 sin x.

I don't get how you figure that out?
is it to determine whether its a min/max?
12. (Original post by lozz2601)
yupppp that's the one!
The more I look at it the more I don't know.....is yours a re-sit too?
yup resit tomorrow!
going through my textbook now lol.
terrified of unit 3 though! I find it SO hard!
13. (Original post by ArchedEdge)
Someone mathsy help me.

12 cos x – 4 sin x = 7

Write down the minimum value of 12 cos x – 4 sin x.

I don't get how you figure that out?
isnt the minnimum when cosx= -1 and sinx=1
?
14. (Original post by jaz_jaz)
is it to determine whether its a min/max?
No the markscheme is really annoying.
Doesn't make sense and I can't understand it
I'm just gonna post it in the maths thread.
Don't get it at all
15. (Original post by raceforthefishman)
isnt the minnimum when cosx= -1 and sinx=1
?
That's what I thought....but then the minimum value is root(160)

Maths forum here I comeeee!
16. (Original post by raceforthefishman)
isnt the minnimum when cosx= -1 and sinx=1
?
Does there exist a number x such that both cosx = -1 and sinx = 1?

Archededge: there are various ways to do it, such as calculus. Alternatively, write 12cosx - 4sinx in the form Rcos(x+a), where R and a are constants to be found. Hence the minimum of 12cosx - 4sinx will be the minimum of Rcos(x+a) which is -R, and this occurs for x+a = pi.
17. (Original post by ArchedEdge)
That's what I thought....but then the minimum value is root(160)

Maths forum here I comeeee!
Don't you use the Cos (A + B) rules? maybe then the R Cos (A + B)?

EDIT: Damn Ghosh beat me to it
18. (Original post by GHOSH-5)
Does there exist a number x such that both cosx = -1 and sinx = 1?

Archededge: there are various ways to do it, such as calculus. Alternatively, write 12cosx - 4sinx in the form Rcos(x+a), where R and a are constants to be found. Hence the minimum of 12cosx - 4sinx will be the minimum of Rcos(x+a) which is -R, and this occurs for x+a = pi.
Oh, and because the minimum of cos is -1, it means the minimum is -R?
AHHHH

EDIT: It won't let me rep you again for another 22 days. Poo
19. (Original post by ArchedEdge)
Oh, and because the minimum of cos is -1, it means the minimum is -R?
AHHHH

EDIT: It won't let me rep you again for another 22 days. Poo

Why go to the maths forum, when the maths forum can come to you
20. (Original post by GHOSH-5)

Why go to the maths forum, when the maths forum can come to you
I didn't realise you were on, otherwise I would've actually waited

But I was getting impatient because clearly it was so simple and I couldn't figure it out, so I just straight there.

Thx bbz

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: April 8, 2010
Today on TSR

How do I get an unconditional offer?

Poll
Useful resources

Got a question about the site content or our moderation? Ask here.

Welcome Lounge

We're a friendly bunch. Post here if you're new to TSR.

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE