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\(ABCD\) is a cyclic quadrilateral whose diagonals intersect at a point \(E\). If \(∠DBC =70^°\), \(∠BAC\) is \(30^°\), find \(∠BCD\). Further, if \(AB=BC\), find \(∠ECD\).
\(∠BCD=\)
\(∠ECD=\)
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