题目内容

(本小题满分13分)

已知向量,且,其中ABC是△ABC的内角,abc分别是角ABC的对边.

(1)    求角C的大小;

(2)    求的取值范围.

 

 

【答案】

16.(1) 由得 

·········································································· 2分

由余弦定理得 ············································ 4分

∵ 

······················································································· 6分

(2) ∵

············ 10分

    ∴

······························································· 13分

 

【解析】略

 

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