Question $3$

Graph, and store as a variable, the parametric surface;

Graph, and store as variables, at least three $(3)$ grid curves for $u_{\text{;}}$

Describe the grid curves for $u$;

Graph, and store as variables, at least three $(3)$ grid curves for $v$;

Describe the grid curves for $v$;

Graph the parametric surface and grid curves on one graph.

Question $4$

Graph, and store as a variable, the non$-$planar parametric surface;

Graph, and store as variables, at least three $(3)$ grid curves for $u$;

Describe the grid curves for $u$;

Graph, and store as variables, at least three $(3)$ grid curves for $v$;

Describe the grid curves for $v$;

Graph the parametric surface and grid curves on one graph.