Texas Instruments TI-86 - Manual (Page 134)

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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.