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Assertion (A): If a chord AB subtends an angle of $60^{\circ}$ at the centre of a circle, then the angle between the tangents at A and B is also $60^{\circ}$.
Reason (R): The length of the tangent from an external point P on a circle with centre O is always less than OP.
Reason (R): The length of the tangent from an external point P on a circle with centre O is always less than OP.
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(D) Assertion (A) is false, but Reason (R) is true.