A parametric curve is determined by two real functions *f* (t) and
*g*(t), on a parameter t. This curve is therefore the set of points
(x=*f* (t),y=*g*(t)), for the different values of t. On the other hand,
we also have the graphs of the two coordinate functions *f* (t) and
*g*(t), which are curves.

This exercise can either present the two curves of *f* (t), *g*(t) and
ask you to recognize the parametric curve (*f* (t),*g*(t)) among others,
or present the parametric curve and ask you to recognize the curves of
*f* (t) and *g*(t).