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∵∠DAE:∠BAE=1:2,∠DAB=90°,∴∠DAE=30°,∠BAE=60°∴∠DBA=90°-∠BAE=90°-60°=30°,∵OA=OB,∴∠OAB=∠OBA=30°∴∠CAE=∠BAE-∠OAB=60°-30°=30°.故答案為30.
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