Texas Instruments TI86 User Manual - Page 119

For DrawF, TanLn, and DrInv, you can use as expression any variable to which a valid expression is stored (including deselected equation variables). In the illustrations, y1=x^3+.3x2N4x is selected. Chapter 6: Graph Tools 107 Drawing a Function, Tangent Line, or Inverse Function For DrawF, TanLn, and DrInv, expression is in terms of x. When you select DrawF, TanLn, or DrInv from the GRAPH DRAW menu, it is pasted to the home screen or program editor. Upon execution, the drawing is returned. DrInv draws the inverse of expression by plotting its x values on the y-axis and its y values on the x-axis. DrInv is available only in Func graphing mode. DrawF expression TanLn(expression,x) DrInv expression In the example, the function y(x)=x^3+.3x2N4x is selected. Also, ZSTD was executed. To draw a diagonal line or curve, turn on the pen, press b b, press ! $ (or # ", and so on), and repeat. DrawF x^3+.3x2+4x TanLn(y1,1.5) DrInv y1 Drawing Freehand Points, Lines, and Curves ᕡ Select PEN from the GRAPH DRAW menu. 6 / ' / ' ᕢ Move the cursor to where you want to begin drawing. " # ! $ ᕣ Turn on the pen. b ᕤ Draw whatever you want. " # ! $ ᕥ Turn off the pen. b To draw more points, lines, or curves, repeat steps 2 through 5. To cancel, press :.