beautypg.com

The graph math menu, Evaluating an equation for a specified theta, Drawing on a polar graph – Texas Instruments TI-86 User Manual

Page 134

background image

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.