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Example 2: To input the function r = 3sin2
θ
into line 2 of Sheet 1 and graph it
In Example 1, we graphed a rectangular expression in the form of y = f(x). You can also input
polar coordinate expressions, inequalities, and other types of functions for graphing as well.
In this example, we input and graph the polar coordinate expression r = 3sin2
θ
. Note that
the following sample procedure assumes that you have already completed the steps for
Example 1.
u ClassPad Operation
(1) Tap anywhere inside of the Graph Editor window to make it active.
(2) Tap the down arrow next to “y =”, or on the menu tap [Type]. On the list that appears,
tap “r =”.
• This causes the line numbers next to any line on the Graph Editor window that does
not contain an expression to change from “y” to “r” (r2, r3, etc.). The line numbers of
lines that already contain expressions do not change.
(3) Tap the input box to the right of line number r2 and input the expression.
k9dTsc8)w
•Tapping w stores the expression you input and puts a check mark into the check
box to the left of line number r2. When a line number has a check mark next to it, it
means that the expression is currently selected for graphing.
3-1-10
Graph & Table Application Overview