54 2. PARAMETRIC, POLAR, AND VECTOR FUNCTIONS
2.0
-2.0
2.0-2.0
Figure 2.3: Parametric curve that intersects itself. Given by x.t/ D 1:8 cos.
4
3
t/, y.t / D
1:8 sin.
20
3
t/.
4.0
-4.0
4.0-4.0
Figure 2.4: Spiral parametric curve. Given by x.t/ D t cos.t/, y.t/ D t sin.t/
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