This stemmed from an office discussion. Often, when writing expressions, it feels like there is a most natural option between different ways of writing the commutative parts of an expression; for instance, the expression $$e^{x}(\sin{(x)}+2)$$ looks more natural than the rarely seen $$(\sin{(x)}+2)e^{x}.$$
Is there a set of agreed-upon "rules" somewhere for the conventional way of writing maths, or is it a cultural thing depending on one's background or field?
