Which of the following is not a polar equation of a conic?

a.

Step-by-step explanation:

The curve

is not a conic.

Convert to rectangular coordinates.

First multiply through by r.

Substitute

and

We can see clearly that this is not a conic.

is an equation of a cardioid.

is a circle.

is a parabola.

is an ellipse.

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step-by-step explanation: