Mathematics
Senior High
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高二數學LA(4B)單元一：空間概念
看不太懂 不會算
36
8. 如圖是一個四角錐,底面ABCD是一個邊長為6的正方
形,其餘4個邊的長均為5。已知側面ADE與底面
ABCD 所形成二面角的大小為日,求cos的值。
A
C
E
B
A/u
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