Describe the graph of the equation. r = 7 sin 8t i – 7 cos 8t j It is a circle of radius 7 in the xy-plane, with center at the point (8, 8). O It is a circle of radius 8 in the xy-plane, with center at the origin. O It is an ellipse in the xy-plane, centered at the origin, with major axis of length 7. O It is a parabola in the xy-plane, with vertex at the origin. O It is a circle of radius 7 in the xy-plane, with center at the origin.

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