【解析】
(1) ∵ ········································ 2分
由得········································ 4分
整理得
∴ ····························································································· 6分
∵ ∴ ·································································· 7分
(2) ∵
∴····························································· 8分
即····················································································· 9分
∴
∴ ················································································· 10分
∴ ································· 13分
【解析】略
，
．
，求角
；
，求
的值．
的值．
是定义在R上的奇函数，且满足
对一切
都成立，又当
时，
，则下列四个命题：
时，
，则
______________．
，则
______________．
的解集是________________．