# How to write Mathematical Expressions using Latex?

LaTeX is a high quality typesetting system. It is mainly used in creating technical and scientific documentation. It possesses an ability to show complex mathematical equations in their fiducial format.

You can use the same markup for writing equations in your question/answers.

Instead of bland looking equations like, E=mc^2, you could use latex to write beautiful equations.
$latex your_latex_code_here $.
For example:
$latex E=mc^2 $
prints: $E=mc^2$

### LaTeX Error

If your $\LaTeX$ code is broken, instead of the equation you’ll see an ugly yellow and red error message. Sorry, we can’t provide support for $\LaTeX$ syntax, but there are plenty of useful guides elsewhere online.  One thing to keep in mind is that Phys Whiz puts all of your $\LaTeX$ code inside a $\LaTeX$ math environment. If you try to use $\LaTeX$ that doesn’t work inside the math environment (such as \begin{align} ... \end{align}), you will get an error: $\LaTeX&s=X$

### LaTeX Size

You can change the size of the LaTeX by specifying an s parameter after the $\LaTeX$ code.

$latex \LaTeX&s=X$

Where X goes from -4 to 4 (0 is the default). These sizes correspond to $\LaTeX$‘s font size commands:

s= font size Example
-4 \tiny $\LaTeX$
-3 \scriptsize $\LaTeX$
-2 \footnotesize $\LaTeX$
-1 \small $\LaTeX$
0 \normalsize (12pt) $\LaTeX$
1 \large $\LaTeX$
2 \Large $\LaTeX$
3 \LARGE $\LaTeX$
4 \huge $\LaTeX$

### LaTeX Colors

You can change the colors of your LaTeX expression. You can specify bg and fg parameters after the $\LaTeX$ code to change the background and foreground colors, respectively. The colors must be in hexadecimal RGB format: ffffff for white, 0000ff for bright blue, etc.

$latex \LaTeX&bg=ffcccc&fg=cc00ff&s=4$ $\LaTeX$

### LaTeX Packages

Phys Whiz uses standard $\LaTeX$ with the following packages:

• amsmath
• amsfonts
• amssymb