Consider this example, inspired by @Lupp’s answer.
The cell-grid area of Calc looks like this (notice the bold
)). That’s helpful for medium-complexity formulas but not so good for large, ugly ones.
Selecting part of a formula and pressing
F9 shows a partial result.
For large formulas, I typically copy and paste the formula into my favorite text editor. Not only does it show the match more clearly, but one keystroke (
%) can jump to the other matching paren.
Indenting also helps.
Presumably, other editors such as Notepad++ or Emacs could be used in the same way.