Lyx might be easier than TexStudio, which I like. Both are front ends to LATEX, a full-blown typesetting tool for producing reports, articles, letters etc. Not really for making blobs of maths for insertion into another package, though it can be done : one output is postscript. Not WYSIWYG either: the idea is the writer just types and lets the typesetter do the formatting to an approved style, typically academic.
Though Lyx and TexStudio power assist by adding boilerplate the input is like this (TexStudio):
Power user tool. Harder to learn than perhaps is justified for doing one or two odd jobs, but pays off big time the more it's used, especially on largish plus documents.
Dave