74
The process is easiest in the SYMB view of Function. When done this way
the result is algebraic rather than numeric. The best method is to define your
function as F1 and its derivative as F2 (see below)…
…but you can also perform the whole process in one line.
As you can see the calculator’s algebraic abilities do not extend to
differentiating
()
2
x
fx
as
()
)
ln 2 .2
x
fx
′
= , but at least it is numerically
correct.
Calculator Tip
Doing your differentiation in the Function aplet is much
easier and offers the additional advantage of being able to
graph the two functions.
Circular functions
There are two issues that influence the
graphing of circular functions, both related to
the scale chosen.
The first one, illustrated on the
right, causes circles to be
ellipses if you don’t choose
scales for the x and y axes
which are ‘square’ relative to each other. The
two graphs above are both of the same
function
22
9xy+=.
press
press
then
.
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