\( A B \) is a diameter of a circle and \( A C \) is its chord such...

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\( A B \) is a diameter of a circle and \( A C \) is its chord such that \( \angle B A C=30^{\circ} \). If the tangent at \( C \) intersects \( A B \) extended at \( D \), then \( B C= \).
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