Could improve more

This is a good app, I used to use Mathcad on Window, but when I switch to Mac, I find here really can not find any samiler software like Mathcad.
However, I found this one. Easy to use and clearly and friendly UI design. I can say, this software worth $10!!!
But, here still something could improve, hope developer could improve this.
the output file is not vector PDF file, only the text part is vector file, but variable part are not. Most of time, I need vector PDF file for latex, that maybe better if output file could be a vector file.
I think our team could improve more. However, back to what I said, this is a good app. Worth to buy it !!!

Zhuangzard about Equation Calculator