This Question was mistakenly migrated to WordPress Answers and closed here. Questions in WPSE relating to WordPress.com-hosted blogs are clearly off-topic there, per FAQ. So the Question was closed there because it's off-topic.
It seems like the Asker just wants to know if it's possible to integrate a LaTex package in their WordPress.com-hosted blog.
One correct Answer would be "No, it's not currently possible. Post a feature request to WordPress.com to integrate that particular package."
relating to integrating asking if LaTex works with Platform [X] considered off-topic here? If so, I apologize in advance.