Tested MathJax v2.1 on iOS 6.1 using same steps mentioned in my previous post, and it works beautifully as expected. Tested on both iPhone/iPad simulator and my iPhone 5, all works perfectly.
Also checked app size on iPhone 5 using "Usage", and as below it's only 7.2MB. You definitely got plenty of space for your other stuffs!
I think if you have to time to do more research, for example, follow steps mentioned in this post by Davide Cervone you should be able to trim down even more! Have a go and welcomed to share your experience with everyone.
Well done, MathJax guys, thanks for the excellent work!