题目内容
(本小题满分13分)
已知向量,且,其中A、B、C是△ABC的内角,a、b、c分别是角A、B、C的对边.
(1) 求角C的大小;
(2) 求的取值范围.
【答案】
16.(1) 由得 ,
即 ·········································································· 2分
由余弦定理得 ············································ 4分
∵
∴······················································································· 6分
(2) ∵
∴ ············ 10分
∵ ∴
∴
∴ ······························································· 13分
【解析】略
练习册系列答案
相关题目