How to use GOOGLEFINANCE(("CURRENCY:EURAUD")) function

The specific instructions for what you are looking for are in here: https://support.google.com/docs/answer/3093281

Remember your Google Spreadsheets Formulas might use semicolon (;) instead of comma (,) depending on Regional Settings.

Once made the replacement on some examples would look like this:

=GoogleFinance("CURRENCY:USDEUR")
=INDEX(GoogleFinance("USDEUR","price",today()-30,TODAY()),2,2)
=SPARKLINE(GoogleFinance("USDEUR","price",today()-30,today()))

Exchange rate from Euro to NOK on the first of January 2016:

=INDEX(GOOGLEFINANCE("CURRENCY:EURNOK"; "close"; DATE(2016;1;1)); 2; 2)

The INDEX() function is used because GOOGLEFINANCE() function actually prints out in 4 separate cells (2x2) when you call it with these arguments, with it the result will only be one cell.

Here you go:

https://support.google.com/docs/answer/3093281

This is all the documentation that Google provides.