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Thread: Maths

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    Pajo's Avatar
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    Maths

    OK, Yuko, here it is:

    (sin3a+sina*cos2a)/1-cosa=ctg(a/2)

    highlighted are degrees...
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  2. #2
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    I'm waiting Yuko.......
    "This wonderful night will give us the colours for our crest: black and blue against a backdrop of gold stars. It will be called Internazionale, because we are brothers of the world."

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    Greece

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    wtf is ctg? :S

    I'm doing C3 maths trigonometry, never came across with ctg! And I have the C4 book, not there either

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    You don't know what is ctg? :wtf: What do you study there man???

    ctg is opposite of tg... There are four trigonometrical functions: sin, cos, tg, ctg...

    ctg=1/tg

    or, ctg=cos/sin, while tg=sin/cos...
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    Greece

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    No I've never came across ctg or tg. We just use sin and cos, as in the book.

    (co)sec θ
    cot θ
    arc(sin/cos/tan)

    Those are the types we use.

    I even asked someone who has graduated from university after studying maths and he doesn't know what ctg is! Maybe your books are ancient

    P.S: I'll tell you what why don't you give me the answer and working out

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    Geezz... and I thought the ABC Formula was hard...
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  7. #7
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    Greece

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    @pajo, If you didn't know, C1, C2, C3, C4, are A-level maths...

    EDIT: http://en.wikipedia.org/wiki/Tangens Still no tg and ctg

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    tg is tan actually... (i think)... tan=sin/cos, right?

    here is the solution:

    (sin3a+sina*cos2a)/1-cosa=ctg(a/2)

    (sina(sin2a+cos2a))/1-cosa=ctg(a/2)

    sina/(1-cosa)=ctg(a/2)

    sin(2a/2)/2(1-cosa/2)=ctg(a/2)

    (2sin(a/2)cos(a/2))/2sin2(a/2)=ctg(a/2)

    ctg(a/2)=ctg(a/2)
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    It'd be nice giving me the question as well as the equation I went ahead and even found a

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    From the wiki, I can see that tan is same with tg... But I don't get it, where is the ctg? I gave you the formulas man...

    sin - sinus
    cos - cosinus
    tg(tan) - tangens
    ctg - cotangens


    and this is the equlation: ctg(a/2)=ctg(a/2)... That ws the whole point of the example, to show that (sin3a+sina*cos2a)/1-cosa=ctg(a/2) is equal to ctg(a/2)=ctg(a/2)...
    "This wonderful night will give us the colours for our crest: black and blue against a backdrop of gold stars. It will be called Internazionale, because we are brothers of the world."

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    Greece

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    That we give BEFORE we ask the other to solve it!

    It's like me telling to you:

    Germany

    You sit your ass down and write a whole essay on its history, culture etc and I only needed you to tell me which is the biggest country Denmark borders with!!!!

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    ctg = cotangens
    tg = tangens

    I can't really believe that you don't do tangens and cotangens at school..

    1/tg = cotg
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    what the **** is cotangen....as far as math..i stopped in grade 11.
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    Quote Originally Posted by UhUhOleguer
    ctg = cotangens
    tg = tangens

    I can't really believe that you don't do tangens and cotangens at school..

    1/tg = cotg

    Yup, that's what I said... Yuko has friend who finished university, and he didn't know what is ctg... Only if maths teacher (she's a bitch) hears this...
    "This wonderful night will give us the colours for our crest: black and blue against a backdrop of gold stars. It will be called Internazionale, because we are brothers of the world."

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  15. #15
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    Greece

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    i know tangents, i just have never seen ctg and tg as expressions.

    Anyway, it was last year's work, so I don't need to remember it

  16. #16
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    Quote Originally Posted by Yuko
    Anyway, it was last year's work, so I don't need to remember it

    Oh, but if you go to university, than you should definitely remember!!
    "This wonderful night will give us the colours for our crest: black and blue against a backdrop of gold stars. It will be called Internazionale, because we are brothers of the world."

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  17. #17
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    C'mon guys, relax a brain litlle, I hate maths too, I will have exam "Maths methods" and I need too start study soon.
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  18. #18
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    Greece

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    Maths is only very hard for those that can't think very well
    And of course those that are too lazy to think

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    Quote Originally Posted by Yuko
    Maths is only very hard for those that can't think very well
    And of course those that are too lazy to think
    Well... you've got Alpha kind of people and Betha kind of people... so... it's just how your brains work.
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    What is Math ?

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