There is no “slight nuance” – “try to answer” is the correct form. “Try and answer” is incorrect.
You try TO do something. If you try AND do it, it implies that first you will try and then you actually accomplish what you have tried; i.e. you will TRY to answer, AND then you will answer.
Alternatively, to try TO answer, implies one verb or one action. Using AND implies two verbs or two actions - to try (first verb/action) AND (then to) answer (second verb/action).
Try answering can also be used but is less common and would usually be utilised in the form of a command – e.g. “Try answering this question”.
[My boss drives me crazy because she uses "try and" frequently throughout her dictation. I always change it to "try to". So far she hasn't noticed].
