Mathematics
Senior High
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求解啊～～拜託各位救救我可悲的高職數學
)13. 若薇、石夾角為0,且|@|=|b|,|a+b|=4,ā−b|=3,則cos 之
7
5
(A)25
(A)
(C)
13
值為何?
(B)
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