B$.$ Sketch the space curve with the given vector equation. Indicate with an arrow the direction in which $t$ increases, For all problems, $1)$ draw the space curve on some $($easy$)$ surface $($e$.$g$.$ we found a cylinder first using just two variables and then drew the space curve on the cylinder$)$ and $2)$ label at least $4($good$)$ t points.

a$.r(t)=($:$cos(3t),4t,sin(3t)$:$)$

b$.r(t)=($:$3,2-t^2,t$:$)$