Unary minus precedence preference

[Thomas Okken]

This is how the Taylor series for the sine is shown in Wikipedia:

$$\huge \sin x = \sum_{n=0}^\infty \frac{(-1)^n}{(2n+1)!} x^{2n+1}$$

It is shown the same way in every math textbook where I have ever encountered it.

The parentheses around the -1 indicate that the minus is not considered to be part of the number, but rather as an operator having lower precedence than exponentiation.

Of course it is always possible to invent new notations, but for this specific issue at least, I'd say chances of such an innovation being widely adopted are ε.