The function $f(t) = \left(\cos\!\left(t\right),\sin\!\left(t\right)\right)$
has how many coordinate functions?

Each coordinate function is of the form $f_i\colon {\bf R}^n\to{\bf R}^m$
where $n$ = and $m$ = .

The second coordinate function is:

$f_{2}($$)$ = .