题目内容
(本小题满分13分)
已知三点A（3，0），B（0，3），C
，
．
（1）若
，求角
；
（2）若
，求
的值．
已知三点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
···························· 2分由
得········································ 4分整理得
∴
····························································································· 6分∵
∴·································································· 7分(2) ∵
∴
····························································· 8分即
····················································································· 9分∴
∴
················································································· 10分∴
································· 13分略
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