(本小題滿分13分)
已知,函數.
(1)求函數的最小正周期;
(2)求函數的單調減區(qū)間;
(3)當時,求函數的值域.
解:
··················································· 2分
································································· 5分
·············································································· 6分
······················································································· 7分
(1) 的最小正周期···································································· 8分
(2) 由得
∴的單調減區(qū)間為··············································· 10分
(3)
∵
∴
∴
∴
即的值域為··············································································· 12分
解析
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