(1)已知函数
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,求函数在区间
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上的单调增区间;
(2)计算:
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.
(1)
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(2)

解:(1)由
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(
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)得
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(
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),
当
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时,得
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,
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,且仅当
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时符合题意,
∴函数

在区间
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上的单调增区间是

.
(2)



.
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
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,设

(Ⅰ)求函数

的周期及单调增区间。
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
的内角

的对边分别为

,已知


,求边

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
,

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
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(Ⅱ)设

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
的对边分别

且

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
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
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已知
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的角

所对的边分别是
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,设向量



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
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
边长c=2,角

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
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已知函数

(
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).
(1)求函数

的最小正周期及单调递增区间;
(2)


内角

的对边长分别为

,若

且

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