Sector[conic c, point A, point B]: Conic section sector between two points A and B on the conic section c (circle or ellipse)
Sector[conic c, number t1, number t2]: Conic section sector between two parameter values t1 and t2 on the conic section c for the following parameter forms:
· Circle: (r cos(t), r sin(t)) where r is the circle's radius
· Ellipse: (a cos(t), b sin(t)) where a and b are the lengths of the first and second axis
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