The SYMB view
key. When you do, your screen should change
so that it appears like the one on the right. This is the
SYMB
view.
Notice that the screen title is supplied so that you will know where you
are (if you didn’t already).
Now press the
Calculator Tip
ENTER
rather than
woul
ENTER
will usually
Pressing
d have had the same effect.
Whenever there is an obvious choice pressing
produce the desired effect.
The
XT
θ
button
Whenever you enter an aplet, one of the keys which often changes its function is the key labeled
XT
θ
. As its
label suggests, it supplies an
X
, or a
T
, or a
θ,
depending on which aplet you are in. Let's use that key to
produce a graph of the quadratic we dealt with in the earlier section on the
HOME
view.
Using the up/down arrows, move the cursor (if necessary) to the line labeled
F1(X) =
.
Type in:
This will produce the screen shown on the right. Notice the check/tick
mark next to the
F1(X)
that appeared when you pressed
ENTER
. This
signifies that this function is to be graphed, so that if you had five
functions entered but only wanted 1 and 3 graphed, you could simply
ensure that only
F1(X)
and
F3(X)
were checked.
ing your function
The key that turns the check on or off is a screen key - the one labeled with the
. In computer
terminology it is a ‘toggle’
key
- when the check is off it turns it on and when on it turns it off. In some
countries a check mark is called a ‘tick’ but the idea is the same.
Try turning the check on and off for function
F1(X)
. Remember, the highlight has to be on the function before
the check can be changed. Make sure it’s checked when you have finished.
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