(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
由得········································ 4分
整理得
∴····························································································· 6分
∵ ∴·································································· 7分
(2) ∵
∴····························································· 8分
即····················································································· 9分
∴
∴················································································· 10分
∴································· 13分
解析
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