The diagonals \( A C \) and \( B D \) of a parallelogram \( A B C D \) intersect each other at t...

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The diagonals \( A C \) and \( B D \) of a parallelogram \( A B C D \) intersect each other at the point \( O \). If \( \angle D A C=42^{\circ} \) and \( \angle A O B=90^{\circ} \), then find the value of \( \angle D B C \).
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