Sharp EL-9900 - Manual (Page 98)

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Chapter 6: Advanced Graphing Features — Advanced Keyboard
3. Polar Graphing
Polar coordinates are a different method of specifying a point in two dimensions; the
location of the point is described by the distance from the X-Y intersect “r”, and its
elevation angle “ θ”.
Example
• Draw a graph: r = 16cos( θ)sin(θ).
1. Press @ ;.
The SETUP menu appears.
2. Press E to select E
COORD, then press 3
to select 3 Polar. Be sure
that the other settings are as
shown on the right.
To exit the SETUP menu,
press C.
3. Press Y.
The Graph Equation Entry window will appear.
4. At the first entry row R1=,
enter 16cos(
θ) ×
sin(
θ).
Press E.
5. Press G to draw the
graph.
Press Z, then press
6 to select 6 Square.
θ
r