**** ti-89 summary pre-test1
What we did on TI-89
Parametric. (get into radian mode)
Mode key, graphing select #2 parametic mode.
green diamond y=, set xt1=sin(t), yt1=cos(6*t)
green diamond window, tmin=0, tmax=2*Pi, tstep=0.1 xmin=-1, xmax=1, ymin=-1,
	ymax = 1
green diamond graph.

Arclength
type in integral, ask for approx (green diamond enter), 
wait, wait, .... wait and eventually the answer appears.

3D. (get into radian mode)
Mode key, graphing select #5 3D mode.
green diamond y=, set z1=sin(x)*sin(y)
green diamond pipe, (pipe is `|'), style=wire and contour
green diamond window, xmin=0, xmax=2*Pi, ymin=0, ymax = 2*Pi, zmin=-2,
	zmax = 2, ncontours=5
green diamond graph.
wait, wait, wait and eventually the graph appears.
rotate with arrow keys
Z gives view from Z axis, similar X and Y keys.

To get z=1/2 contour change
green diamond window, zmin=0, zmax=1, ncontour=1
green diamond graph.

To get z=1 contour change
green diamond window, zmin=0, zmax=2, ncontour=1
green diamond graph.

repeat.