11.
設A,B,C,D四點在同一直線上,且\( \overline{AB}:\overline{BC}:\overline{CD}=3:5:4 \),若以\( \overline{BC} \)為直徑作圓,取圓上任一點P(但\( P \ne B \),\( P \ne C \) ),令\( ∠APB=\alpha \),\( ∠CPD=\beta \),求\( tan \alpha \times tan \beta \)
設四點A-B-C-D且\( \overline{AB}:\overline{BC}:\overline{CD}=2:3:1 \),以\( \overline{BC} \)為直徑作圓,取圓上一點P(但\( P\ne B \),\( P \ne C \)),則\( (tan∠APB)\times (tan∠CPD)= \)?
(99中正預校,https://math.pro/db/thread-990-1-1.html) 作者: iamcfg 時間: 2011-6-25 20:40