# Hello everyone!

• May 5th 2013, 12:35 PM
majovski
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..

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

$3x^2+x$
• May 5th 2013, 12:51 PM
a tutor
Re: Hello everyone!
Hi. Something on this page should help. :)

LaTeX Help
• May 6th 2013, 01:38 AM
Natassha
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
• December 22nd 2013, 11:40 PM
majovski
Re: Hello everyone!
just testing:

$-5x^2$
• February 5th 2014, 10:35 AM
majovski
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

$sinx+cosx=0$

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

$\frac{sinx}{cosx}=-1$

$tanx=-1$

$x_1=pi/4+k*pi$
$x_2=3/4pi+k*pi$
• February 5th 2014, 10:44 AM
romsek
Re: Hello everyone!
they'll appear the same but proper syntax is \sin x, \cos x, \tan x etc.
• February 5th 2014, 10:49 AM
majovski
Re: Hello everyone!
thanks for answer, but have you found any mistakes please?
• February 5th 2014, 10:56 AM
romsek
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.
• February 5th 2014, 11:00 AM
majovski
Re: Hello everyone!
That's great, i am so grateful for you. Have a nice day