HP 48g Graphing Calculator - Manual (Page 295)

The PICTURE FCN Menu (continued)
Key Description
Extremum. Moves the cursor to an extremum (local
minimum or maximum) or other critical point and
displays the ( x , y ) coordinates. If the closest extremum
or inflection point is not in the display window, briefly
displays the message OFF SCREEN before displaying
the value.
Function Value. Displays the function value at the
current r-value of the cursor, and moves the cursor to
that point on the function curve.
p > Derivative Plot. Plots the first derivative of the
function and replots the original function. Also adds
the symbolic expression for the first derivative to the
contents
oi EQ. (If EQ is a list, F ' adds the expression
to the front of the list. If EQ is not a list, F ' creates a
list and inserts the expression to the front of the list.)
1 nm,_. Tangent Line. Draws the line tangent to the current
function at the z-value represented by the cursor. It
returns the equation of the tangent line to the stack.
Next Equation. R,otates the list in EQ and displays
the equation now at the beginning of the list. (The
second equation is moved to the beginning of the list
and the first equation is moved to the end.)
I E \ 4 View Equation. Displays currently selected equation
from EQ or EQ list.
p p
Picture. Displays the PICTURE menu.
22
Plotting 22-11