Texas Instruments TI-86 - Manual (Page 108)

96
Chapter 6: Graph Tools
06TOOLS.DOC TI-86, Chap 6, US English Bob Fedorisko Revised: 02/13/01 2:23 PM Printed: 02/13/01 3:01 PM Page 96 of 22 06TOOLS.DOC TI-86, Chap 6, US English Bob Fedorisko Revised: 02/13/01 2:23 PM Printed: 02/13/01 3:01 PM Page 96 of 22
ROOT Finds the root of a function using a specified left bound, right bound, and guess
dy à dx Finds a numeric derivative (slope) of a function at the trace cursor location
‰ f(x) Finds a function’s numerical integral using a specified left bounds and right bound
FMIN Finds a function’s minimum using a specified left bound, right bound, and guess
FMAX Finds a function’s maximum using a specified left bound, right bound, and guess
INFLC Finds a function’s inflection point using a specified left bound, right bound, and guess
YICPT Finds a function’s y-intercept ( y at x=0 )
ISECT Finds the intersection of two functions using a specified left bound, right bound, and guess
DIST Finds the straight-line distance between a specified left bound and right bound
ARC Finds the distance along a function between two specified points on the function
TANLN Draws the tangent line at a specified point
Settings That Affect GRAPH MATH Operations
♦
The tolerance variable tol (Appendix) affects the accuracy of ‰ f(x) , FMIN , FMAX , and ARC .
Accuracy increases as the tolerance value becomes smaller.
♦
The step-size variable d (Appendix) affects the accuracy of dy à dx , INFLC in dxNDer
differentiation mode (Chapter 1), ARC , and TANLN . Accuracy increases as the step-size
value becomes smaller.
♦
The differentiation mode setting affects dy à dx , INFLC , ARC , and TANLN ; dxDer1 (exact)
mode is more accurate than dxNDer (numeric) mode (Chapter 1).
The GRAPH MATH menu
differs slightly for Pol and
Param
graphing modes
(Chapters 8 and 9).
DifEq graphing mode has no
GRAPH MATH menu.