# 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!

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
• Dec 22nd 2013, 11:40 PM
majovski
Re: Hello everyone!
just testing:

$\displaystyle -5x^2$
• Feb 5th 2014, 10:35 AM
majovski
Re: Hello everyone!
just testing 2:
$\displaystyle 2sin^2x+cos^2x+sinxcosx=1$

$\displaystyle 2(1-cos^2x)+cos^2x+sinxcosx=1$

$\displaystyle 2-2cos^2x+cos^2x+sinxcosx=sin^2x+cos^2x$

$\displaystyle 2-cos^2x+sinxcosx=sin^2x+1-sin^2x$

$\displaystyle 2-(1-sin^2x)+sinxcosx=1$

$\displaystyle 2-1+sin^2x+sinxcosx=1$

$\displaystyle 1+sin^2(x)+sinxcosx=1$

$\displaystyle sin^2x+sinxcosx+0$

$\displaystyle sinx(sinx+cosx)=0$

1. CASE

$\displaystyle sinx=0$

$\displaystyle x=k*pi$

2. CASE

$\displaystyle sinx+cosx=0$

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

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

$\displaystyle tanx=-1$

$\displaystyle x_1=pi/4+k*pi$
$\displaystyle x_2=3/4pi+k*pi$
• Feb 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.
• Feb 5th 2014, 10:49 AM
majovski
Re: Hello everyone!