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In the given figure, AR and RT are tange...

In the given figure, `AR` and `RT` are tangents to the circle with center `O`. `B` is the mid point of `QS`. If AOBT is a straight line, then which of the following is/are true? (1) `OA=OR` (2) `OQTS` is a cyclic quadrilateral (3) `SQ=AR` (4) All of these.

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