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The Soc for People of 'GRDCT2008' Mk VI watch

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

    anyhoo. argh.
    Don't forget you can use my Tutor2u thing if you need it
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    (Original post by letsdothetimewarpagain)
    I gave natty subs in return for favours :sexface:
    Can I get in on this? :tehe:
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    (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!
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    (Original post by lozz2601)
    why am I putting myself through an economics retake...... :mad:

    anyhoo. argh.
    unit 1?
    i have it tomorrow! revision just isnt happening really..
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    (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?
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    (Original post by letsdothetimewarpagain)
    I gave natty subs in return for favours :sexface:
    :rofl:

    Beth, don't make me laugh :toofunny:


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    All though a sub right now or some riches would be appreciated :puppyeyes: :flutter:
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    Whats life like on the sub side?
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    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?
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    (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 d^2y/dx^2 to determine whether its a min/max?
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    (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!
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    (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
    ?
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    (Original post by jaz_jaz)
    is it d^2y/dx^2 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
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    (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!
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    (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.
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    (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? :beard: maybe then the R Cos (A + B)?

    EDIT: Damn Ghosh beat me to it :emo:
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    (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
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    (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
    :perv:

    Why go to the maths forum, when the maths forum can come to you :awesome:
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    (Original post by GHOSH-5)
    :perv:

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

    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
 
 
 
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