HP F2226A - 48GII Graphic Calculator User Manual page 443

maxima) of the function, to plot the derivative, and to find the equation of the
tangent line.
Try the following example for the function y = tan(x).
• Press „ô, simultaneously in RPN mode, to access to the PLOT
SETUP window.
• Change TYPE to FUNCTION, if needed, by using [@CHOOS].
• Press ˜ and type in the equation 'TAN(X)'.
•
Make sure the independent variable is set to 'X'.
• Press L @@@OK@@@ to return to normal calculator display.
• Press „ò, simultaneously, to access the PLOT window
•
Change H-VIEW range to –2 to 2, and V-VIEW range to –5 to 5.
• Press @ERASE @DRAW to plot the function in polar coordinates.
The resulting plot looks as follows:
•
Notice that there are vertical lines that represent asymptotes. These
are not part of the graph, but show points where TAN(X) goes to ± ∞
at certain values of X.
• Press @TRACE @(X,Y)@, and move the cursor to the point X: 1.08E0, Y:
Next, press L@) @ FCN@ @SLOPE.
1.86E0.
4.45010547846.
• Press LL@TANL.
tangent line, and plots its graph in the same figure. The result is
shown in the figure below:
This operation produces the equation of the
The result is Slope:
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