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This plugin can let you add mathematical equations to your posts using latex. Google chart API is used in this plugin to turn the latex strings to equation images. The equation images will be stored on your site, so it will be efficient.

To add equations in your articles, just surround the latex script with [eq] and [/eq] tags. For example, add following codes [eq]\alpha+\beta\geq\gamma[/eq] in your posts.