(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...

(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．

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

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