(本小題滿分13分)
已知,函數(shù)
(1)求函數(shù)的最小正周期;
(2)求函數(shù)的單調(diào)減區(qū)間;
(3)當(dāng)時(shí),求函數(shù)的值域.

解:
··················································· 2分

································································· 5分
·············································································· 6分
······················································································· 7分
(1) 的最小正周期···································································· 8分
(2) 由
的單調(diào)減區(qū)間為··············································· 10分
(3)


    


的值域?yàn)?img src="http://thumb.zyjl.cn/pic5/tikupic/ce/8/1q2pt4.gif" style="vertical-align:middle;" />··············································································· 12分

解析

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