Question

w

求解🙇🏻

2)以AD為直徑作圓,B、C把AD三等分,在圓上取一點
E(EA ED) ZAEB a CED=ẞ
tan a tan ẞ=
BAG *<
X
ECFC
证
。
+EA = CF
1
1
Ans:
4
D
B
C
BR = CE