## FAQ and Help

1. What is the purpose of this site?

2. What can I do on 9math?

3. How to use Latex to write equations on the site?

4. How to draw the graph of a function?

5. How to play with the interactive geometry figures?

6. How to create new interactive geometry figures?

7. How can I contact you?

1. What is the purpose of this site?

The purpose of this site is to be the best environment for math learning and math discussions.

You can ask and answer math questions on the forum.

You can read the math theory pages and comment on them if you want.

3. How to use Latex to write equations on the site?

When posting on the site you can insert Latex code between two $. The site has a build in Google gadget made by sitmo so you have a visual Equation Editor. You just have to copy and then paste the generated code between the two $ into your post.

Latex examples:

$\alpha+\beta=\gamma$

$\sin(\frac{\pi}{2})=1$

4. How to draw the graph of a function?

To draw the graph of a function you just write that function between the [g r a p h] and [/g r a p h] tags (with no spaces).

Graph examples:

[g r a p h]x^2[/g r a p h]

Or you can put 2 or more functions on the same sheet:

[g r a p h]sin(x);tan(x)[/g r a p h]

To be more exact about what part of the graph you want to be shown you can use xmin, xmax, ymin and ymax:

[g r a p h xmin="-1" xmax="4" ymin="-1" ymax="4"]e^x;x+1;ex[/g r a p h]

5. How to play with the interactive geometry figures?

You can drag the green and the blue dots. The green dots can be dragged freely and the blue ones are restricted to a line.

In this example of a trapezoid, A, B and C can be anywhere (so they are green) and D is restricted to the line that crosses through A and is parallel to BC (so D is blue).

Go to the geometry pages for more exemples.

6. How to create new interactive geometry figures?

You can draw right now by going to the interactive geometry editor. This editor appears near the bottom of the page when you write or edit a post. For more answers go to the interactive geometry editor help.

Our email address is *office [at] 9math.com*