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ABCD is a cyclic quadrilateral whose ...

ABCD is a cyclic quadrilateral whose diagonals intersect at a point E. If `/_D B C"\ "="\ "70^o,` `/_B A C"\ "i s"\ "30^o` , find `/_B C D` . Further, if `A B"\ "="\ "B C` , find`/_E C D` .

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