Texas Instruments TI-86 ユーザーズマニュアル
122
Chapter 8: Polar Graphing
08POL.DOC TI-86, Chap 8, US English Bob Fedorisko Revised: 02/13/01 2:26 PM Printed: 02/13/01 3:02 PM Page 122 of 8
08POL.DOC TI-86, Chap 8, US English Bob Fedorisko Revised: 02/13/01 2:26 PM Printed: 02/13/01 3:02 PM Page 122 of 8
08POL.DOC TI-86, Chap 8, US English Bob Fedorisko Revised: 02/13/01 2:26 PM Printed: 02/13/01 3:02 PM Page 122 of 8
The GRAPH MATH Menu
6 / &
MATH
DRAW FORMT STGDB RCGDB
DIST
dy
à
dx
dr
à
d
q
ARC
TANLN
dr
à
d
q
Finds the numerical derivative (slope) of a function at a point
The distances calculated by
DIST
and
ARC
are distances in the rectangular coordinate plane.
dy
à
dx
and
dr
à
d
q
are independent of the
RectGC
or
PolarGC
format.
At a point where the derivative is undefined,
TANLN
will draw the line, but no result is
displayed or stored in
Ans
.
Evaluating an Equation for a Specified q
When the trace cursor is not active, the
GRAPH
menu item
EVAL
evaluates selected polar
equations directly on the graph for a given value of
q
.
eval
in a program or from the home
screen returns a list of
r
values.
Drawing on a Polar Graph
The
GRAPH
DRAW
menu items work the same in
Pol
graphing as in
Func
graphing.
DRAW
instruction coordinates in
Pol
graphing mode are the x- and y-coordinates of the graph
screen.
DrInv
is not available in
Pol
graphing mode.
The other
GRAPH
MATH
menu items are the same as
described in Chapter 6.
described in Chapter 6.