Probably I should have also mentioned that it is expected (at least from experienced users) that if a tag is created, the tag-creator also creates the tag-info. (At least in the cases where it is not obvious what questions should the tag used be for, this information should be included in the tag-excerpt.) See, for example,
here.
Can we say that for any given function in single/multivariable, it is always possible to have a parametric form? (Elementary functions, complicated functions?)
Given any function, is parametric form uniquely determined?
