(本小題滿分13分)
已知三點(diǎn)A(3,0),B(0,3),C
(1)若,求角
(2)若,求的值.

解:(1) ∵···························· 2分
········································ 4分
整理得
····························································································· 6分
      ∴·································································· 7分
(2) ∵
····························································· 8分
····················································································· 9分
     
················································································· 10分
································· 13分

解析

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