Hello everybody,
first of all, I am German and not the most skilled English speaker, so please
be patient;)
My question:

I copied a webpage full of mathematic terms as fractions, radicals, logarithms
etc. The copied version of this page is not able to show these terms
correctly. 
It appears this for example: 
"\displaystyle \frac{2}{3}"
Instead of displaying the normal fraction version. In this case, it would be
easy to read that strange notation, whereas there are even cases, when the
encrypting seems impossible and surely it's the roundabout way of doing it. 

 Do you understand my problem? And is there a solution to it? 
I would be so glad, if someone could help me. 

Thank you very much
Mathias