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
练习册系列答案
导学与测试系列答案
新非凡教辅冲刺100分系列答案
相关题目
的最小正周期；（ 6分）
时，求
的集合.
．
的最小正周期．
时，
的值， 
=
，且
． 
，试求
的值．
.
的最小正周期
；
的三边
满足
，且边
所对角为
，试求
的取值范围，并确定此时
的最大值。
的最大值，及当取最大值时x的取值集合。
的最大值.
的终边上有一点
则
的值是（ ）
.
的最小正周期及
,且
,求
的值.
.
的值；
，求
的值.