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(2007•烟台)如图,已知AB是半圆O的直径,弦AD、BC相交于点P,若∠DP...
(2007•烟台)如图,已知AB是半圆O的直径,弦AD、BC相交于点P,若∠DPB=α,那么CD:AB等于( )
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A.sinα
B.cosα
C.tanα
D.
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