Unformatted text preview: hich stands for “polar”. This changes the “Y=” menu as seen above in the middle. Let’s plot the polar rose given
by r = 3 cos(4θ) from Exercise 1h above. We type the function into the “r=” menu as seen
above on the right. We need to set the viewing window so that the curve displays properly,
but when we look at the WINDOW menu, we ﬁnd three extra lines. In order for the calculator to be able to plot r = 3 cos(4θ) in the xy -plane, we need to tell
it not only the dimensions which x and y will assume, but we also what values of θ to use.
From our previous work, we know that we need 0 ≤ θ ≤ 2π , so we enter the data you see
above. (I’ll say more about the θ-step in just a moment.) Hitting GRAPH yields the curve
below on the left which doesn’t look quite right. The issue here is that the calculator screen
is 96 pixels wide but only 64 pixels tall. To get a true geometric perspective, we need to hit
ZOOM SQUARE (seen below in the middle) to produce a more accurate graph which we
present below on the right....
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