I decided it would be a good idea to test out the instructions from my last post, where I explain how to put mathematics in your blog. This is fast becoming addictive, so I am going to have to sit on my hands for a while after this post.

A Cross Product Formula

\[\mathbf{V}_1 \times \mathbf{V}_2 = \begin{vmatrix}

\mathbf{i} & \mathbf{j} & \mathbf{k} \\

\frac{\partial X}{\partial u} & \frac{\partial Y}{\partial u} & 0 \\

\frac{\partial X}{\partial v} & \frac{\partial Y}{\partial v} & 0

\end{vmatrix} \]

That seemed to work, but I did notice a couple of glitches. So here are a few hints.

- After you paste in the HTML, consider typing a couple of characters ("xx" or similar) as a placemarker so that you can be sure where your blog text is being inserted in relation to the script calls (the scripts should be
*right at the start*). It's usually a good idea to lay down a marker like this when switching between “compose” and “HTML” editing modes.

- If you want to put a formula in-line just write it with a dollar sign before and after. So

`and therefore $x^2$ cannot be zero`

will come out as:

*and therefore $x^2$ cannot be zero*

- When TeX inputs are copied from the web, to avoid formatting confusion it is often better to either paste into the HTML edit mode, or paste into a text window and re-copy to lose the formatting before pasting into the compose edit mode.
- If at first you don't succeed, look for help among the TeX community. It is large, and many of its members are professional educators.

\sum_{i=0}^{i=10} \phi_i(3)

\end{equation}

\begin{equation}\label{eq2}

\int_{0}^{10} \phi_i(x)dx = 3

\end{equation}

\[

g\frac{d^2u}{dx^2} + L\sin u = 0

\]

g\frac{d^2u}{dx^2} + L\sin u = 0

\]

While my testing can hardly be called exhaustive, I think I have provided as good a start as anyone could expect in the world of mathematical blogging. Good luck with yours!

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