i was just wondering how to do the symbol for a derivative and a double derivative, and the symbol for theta??

using LaTeX, type [math]\frac{\,dy}{\,dx}[/math] to get , [math]\frac{d^2y}{\,dx^2}[/math] to get , and [math]\theta[/math] to get . However, I prefer [math]\vartheta[/math] to get

You can find more tutorials and the such in the LaTeX Help part of the forums.

--Chris

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Furthermore:

[math]\dot{x}[/math] gives

[math]\ddot{x}[/math] gives

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