Question: Let S be a circle with centre O and radius 2. A and B be two points on the circle. ?AOB=x, tangents at A and

Let S be a circle with centre O and radius 2.

Let S be a circle with centre O and radius 2. A and B be two points on the circle. ?AOB=x, tangents at A and B intersect at D and OA and BD intersect at C. Then which of the following must be correct?

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