Personally I've adopted Wolfram Language (formerly Mathematica) 's convention of indicating the application of function f to variable x as f[x] rather than f(x)

Personally I've adopted Wolfram Language (formerly Mathematica) 's convention of indicating the application of function f to variable x as f[x] rather than f(x) precisely to avoid ambiguities such as those indicated towards the bottom of the article. I've also seen and adopted the convention of using a very clear -1 exponent to indicate reciprocals and -I (vertical unadorned bar) to indicate an inverse function. It kind of works to lessen the confusion, though of course clarity is in the eyes of the beholder.