Texas Instruments TITANIUM TI-89 User Manual page 767

3. Use the
abs( )
value of
f(x+yi)
(This calculation may take about 2
minutes.)
The absolute value of a function
Note:
forces any roots to visually just touch
rather than cross the
absolute value of a function of two
variables will force any roots to visually
just touch the
4. Copy and paste the last answer to the
entry line and store it in the function
.
z1(x,y)
The graph of
Note:
modulus surface.
5. Set the unit to 3D graph mode, turn on the
axes for graph format, and set the
Window variables to:
eye= [20,70,0]
x= [ L 2,2,20]
y= [ 2,2,20]
L
z= [ L 1,2]
ncontour= [5]
Activities
function to find the absolute
.
axis. Likewise, the
x
plane.
xy
will be the
z1(x,y)
767