r = 3cos (4t); 0. <= t <= Pi*2

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r =

1+3cos(t); 0.0 <= t <= pi*2

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r = cos(3t); 0.0 <= t <= pi*2

r = -1+cos(t); 0.0 <= t <= 2pi

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r = 2-3cos(t); 0.0 <= t <= 2pi

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r = 5cos(2t)-3cos(2t)-cos(4t); 0.0 <= t <= 2pi

r = -3cos(2t); 0.0 <= t <= 2pi

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