關(guān)于函數(shù)
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,有下列命題:
(1)
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為偶函數(shù),
(2)要得到函數(shù)

的圖像,只需將
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的圖像向右平移
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個(gè)單位,
(3)
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的圖像關(guān)于直線
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對稱.
(4)
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在
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內(nèi)的增區(qū)間為
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和
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;
其中正確命題的序號為
.
(1)由于
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顯然不是偶函數(shù),所以(1)錯(cuò);
(2)將函數(shù)
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的圖像向右平移
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個(gè)單位后得
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,
故(2)正確;
(3)當(dāng)
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時(shí),
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,所以
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的圖像關(guān)于直線
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對稱正確.
(4)由
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,知
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,令k=0和k=1
可知
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在
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內(nèi)的增區(qū)間為
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和
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;故(4)錯(cuò).
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
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
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
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
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
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
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
的圖像可以由

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
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
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
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
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
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
,已知


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
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已知函數(shù)

,

(Ⅰ)求函數(shù)

的最大值和最小正周期;
(Ⅱ)設(shè)

的內(nèi)角

的對邊分別

且

,
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求

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已知函數(shù)

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(I)函數(shù)

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(II)函數(shù)

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右圖所示的是函數(shù)

圖象的一部分,則其函數(shù)解析式是( )

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