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Math Help - Hello everyone!

  1. #1
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    Hello everyone!

    Hello, My name is Martin, I'm from Czech republic. I study at High school. Math is my favourite subject. I hope I will learn something new at this forum :-)


    PS: May I ask you for send me a link for using latex. I used latex for many years at Czech math forum but here I have no idea..

    $x^2+3x+9=0$

    $3x^2+x$
    Last edited by majovski; May 5th 2013 at 01:38 PM.
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  2. #2
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    Re: Hello everyone!

    Hi. Something on this page should help.

    LaTeX Help
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  3. #3
    Newbie Natassha's Avatar
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    Re: Hello everyone!

    Welcome to Math help Forum! Here LaTeX don't work if you type with in $__$ sign. All codes are same just type using TEX and /TEX
    Last edited by Natassha; May 6th 2013 at 02:41 AM.
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  4. #4
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    Re: Hello everyone!

    just testing:


    -5x^2
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  5. #5
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    Re: Hello everyone!

    just testing 2:
    2sin^2x+cos^2x+sinxcosx=1

    2(1-cos^2x)+cos^2x+sinxcosx=1

    2-2cos^2x+cos^2x+sinxcosx=sin^2x+cos^2x

    2-cos^2x+sinxcosx=sin^2x+1-sin^2x

    2-(1-sin^2x)+sinxcosx=1

    2-1+sin^2x+sinxcosx=1

    1+sin^2(x)+sinxcosx=1

    sin^2x+sinxcosx+0

    sinx(sinx+cosx)=0

    1. CASE

     sinx=0

    x=k*pi

    2. CASE

    sinx+cosx=0

     \frac{sinx}{cosx}+1=0

     \frac{sinx}{cosx}=-1

     tanx=-1


     x_1=pi/4+k*pi
     x_2=3/4pi+k*pi
    Last edited by majovski; February 5th 2014 at 11:50 AM.
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  6. #6
    MHF Contributor
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    Re: Hello everyone!

    they'll appear the same but proper syntax is \sin x, \cos x, \tan x etc.
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  7. #7
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    Re: Hello everyone!

    thanks for answer, but have you found any mistakes please?
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  8. #8
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    Re: Hello everyone!

    I didn't check, I thought you were just testing the LaTex...

    You've got some unnecessary steps but you get the correct answer in the end.
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  9. #9
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    Re: Hello everyone!

    That's great, i am so grateful for you. Have a nice day
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